Apple iPhone 9 has better RAM than Apple iPhone 6 Plus (64GB). Neither of them has front Flash. In terms of display resolution, Apple iPhone 6 Plus (64GB) has better resolution of 1920 x 1080 than Apple iPhone 9 which has resolution of 1334 x 750. Both have the same amount of internal memory.
| Name | Apple iPhone 6 Plus (64GB) | Apple iPhone 9 | 
| RAM | 1 GB | 3 GB | 
|---|---|---|
| Display | 5.5 in | 4.7 in | 
| Internal Memory | 64 GB | 64 GB | 
| Battery | 2915 mAh | 2050 mAh | 
| Camera | 8 MP | 12 MP | 
| Price | Rs. 48999 | Rs. 29990 | 
The launch Date of the first phone is September, 2014. The cost of Apple iPhone 6 Plus (64GB) is Rs. 48999. The cost of Apple iPhone 9 is Rs. 29990.
Apple iPhone 9 has screen size of 4.7 inches which falls short to Apple iPhone 6 Plus (64GB)'s 5.5 inch screen. Apple iPhone 6 Plus (64GB) has IPS LCD Screen type where as Apple iPhone 9 has LCD Screen type. Apple iPhone 6 Plus (64GB) has display density of 401 PPI & Apple iPhone 9 has only 294 PPI display density. In terms of screen to body ratio, Apple iPhone 9 has better screen to body ratio of ~ 79.67% than Apple iPhone 6 Plus (64GB)'s ~ 67.8%. Both mobiles have same aspect ratio of 16:9.
Apple iPhone 9's larger 3 GB RAM is better for playing games and all with respect to Apple iPhone 6 Plus (64GB)'s lower 1 GB RAM. and both have same Internal Memory of 64 GB.
Apple iPhone 9's 12 MP Rear Camera outclasses Apple iPhone 6 Plus (64GB)'s 8 MP Rear Camera in terms of resolution. Apple iPhone 9 will be better choice if you're looking to click lot of selfies as it has better 7 MP Front Camera in comparison to Apple iPhone 6 Plus (64GB)'s 1.2 MP Front Camera.
Both the phones has iOS Operating System but the first one runs on version 8 and the second one on v13.0 version.
| Name | Apple iPhone 6 Plus (64GB) | Apple iPhone 9 | 
| General | ||
| Model | iPhone 6 Plus | iPhone 9 | 
| Sim Type | Single Sim, GSM | Single Sim, GSM | 
| Dual Sim | No | No | 
| Sim Size | Nano SIM | Nano SIM | 
| Device Type | Smartphone | Smartphone | 
| Release Date | September, 2014 | |
| Design | ||
| Dimensions | 77.8 x 158.1 x 7.1 mm | 67.4 x 138.5 x 7.8 mm | 
| Weight | 172 g | |
| Display | ||
| Type | Color IPS LCD Screen (16M colors Colors) | Color LCD Screen (16M Colors) | 
| Touch | Yes | Yes | 
| Size | 5.5 inches, 1080 x 1920 pixels | 4.7 inches, 750 x 1334 pixels | 
| Aspect Ratio | 16:9 | 16:9 | 
| PPI | ~ 401 PPI | ~ 294 PPI | 
| Screen to Body Ratio | ~ 67.8% | ~ 79.67% | 
| Features | Ion-strengthened Glass, Oleophobic Coating | |
| Notch | Yes, Large Notch | |
| Memory | ||
| RAM | 1 GB | 3 GB | 
| Storage | 64 GB | 64 GB | 
| Card Slot | No | No | 
| Connectivity | ||
| GPRS | Yes | Yes | 
| EDGE | Yes | Yes | 
| 3G | Yes 42 Mbps Download 5.76 Mbps Upload | Yes | 
| 4G | Yes | Yes | 
| VoLTE | Yes | |
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Bluetooth | Yes, v4.0 | Yes, v5.0 | 
| USB | Yes, Proprietary v2.0 | Yes, Proprietary v2.0 | 
| Extra | ||
| GPS | Yes, with A-GPS Support | yes with A-GPS, Glonass | 
| Fingerprint Sensor | Yes | Yes | 
| Face Unlock | No | |
| Sensors | Accelerometer, Gyroscope, Compass, barometer, Proximity | Light sensor, Proximity sensor, Accelerometer, Compass, Gyroscope | 
| 3.5mm Headphone Jack | Yes | |
| NFC | Yes | Yes | 
| Water Resistance | No | |
| Dust Resistant | No | |
| Extra Features | Wi-Fi calling, Apple Pay, iCloud cloud service | |
| Camera | ||
| Rear Camera | 8 MP | 12 MP ƒ/1.8 | 
| OIS | Yes | |
| Auto Focus | Yes | Yes | 
| Features | Face detection, Smile detection, Geo tagging, Panorama, Touch to focus | Digital Zoom, Auto Flash, Face detection, Simultaneous HD video and image recording, Touch to focus | 
| Video Recording | 1080p @ 60 fps FHD | 1080p @ 30/60 fps FHD | 
| Flash | Yes, Dual LED | Yes, LED | 
| Front Camera | 1.2 MP | 7 MP ƒ/2.2 | 
| Front Video Recording | 1080p @ 30 fps FHD | |
| Technical | ||
| OS | iOS v8, upgradable to v12.1 | iOS v13.0 | 
| Chipset | Apple | Apple A13 Bionic | 
| CPU | 1.4 GHz, Dual Core Processor | 2.65 GHz, Hexa Core Processor | 
| Core Details | 2.65 GHz, Dual core, Lightning + 1.8 GHz, Quad core, Thunder | |
| GPU | PowerVR GX6450 (quad-core graphics) | Apple GPU | 
| Java | No | No | 
| Browser | Yes, supports HTML5 (Safari) | Yes, supports HTML5 | 
| Multimedia | ||
| Supports | MMS, Instant Messaging, Voice Commands | |
| Yes, with Push Email | Yes | |
| Music | MP3, WAV, AAX+, AIFF | Yes | 
| Video | MP4, H.264 | Yes | 
| FM Radio | No | No | 
| Document Reader | Yes | Yes | 
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 2915 mAh, Li-Po Battery | 2050 mAh, Li-ion Battery | 
| Fast Charging | Yes, Fast | |
| Music Playback Time | 80 hours | |