I have done some research online and show you the differences among Launch X431 pro mini/Pros Mini / Diagun IV /V & V+ as seems some are interested. Summarizes it nicely. Hope will help you make a good decision.
1. Launch X431 Pro Mini VS X431 PRO VS X431+ VS X431 V Wifi / Bluetooth scanner
| Appearance |  |
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| Item | X431 PRO 7inch | Launch X431 V 8 inch | Launch X431 V+ | Launch X431 pro mini |
| Avalibility | Avalibility | Avalibility | Avalibility | Avalibility |
| Update | one-click update online for 2 years free | one-click update online for 2 years free | one-click update online for 2 years free | one-click update online for 2 years free |
| Automotive Diagnostics | √ | √ | √ | √ |
| Remote Diagnosis | √ | √ | √ | √ |
| Recording and playback | √ | √ | √ | √ |
| special function | √ | √ | √ | √ |
| Waveform Display | √ | √ | √ | √ |
| VIN Identification | √ | √ | √ | √ |
| feedback | √ | √ | √ | √ |
| Diagnostic Software | LAUNCH Vehicle Coverage Inquiry System: http://qcar.x431.com/ | |||
| OS | Android | Android 4.2 | Android 7.1 | Android 5.1 |
| SIZE | 7-inch Tablet,1024X600 | 8” 1280 x 800 IPS display with 189 ppi | 10.1 inch with 1280*800 resolution | 6.9 inch 1280 x 720 |
| CPU | Dual core 1GHz | Quad core 1.3 GHz | quad-core 1.2 GHz | Quad core 1.3 GHz |
| RAM | 512MB | 1 GB | 1GB | 2GB |
| Capacity (internal / SD card) | 2GB | 16GB (expandable by up to 32 GB) | 8GB | 16GB |
| Battery | 3000mh, rechargeable polymer lithium battery | 4200mh rechargeable polymer lithium battery | 6600mAh | 3.7V/3000mh rechargeable polymer lithium battery |
| Pixels | : 2 mega rear and 0.3 mega front | Front-facing 2 MP camera and rear-facing 5 MP | 0.3M pixels front /rear 3.2M pixels | Front-facing 2MP camera + rear-facing 5MP camera |
| camera with 1080p HD video recording | ||||
| Connectivity | WIFI/Bluetooth | Wi-Fi: WLAN 802.11b/g/n | WiFi/Bluetooth | Wi-Fi: WLAN 802.11b/g/n, Bluetooth: Bluetooth 4.1 |
| Bluetooth: Bluetooth 4.0 | ||||
2. Launch X431 V 8 Inch VS Launch X431 Diagun IV
The major difference between Launch X431 V 8.0 and Launch X431Diagun IV lies in:
（1）. Lanch X431 V support much more vehicle brands, like Indian (Mahindra, TATA), Australian Ford, Holden, Malay Porton, Perodua, Brazilian Fiat,GM etc, which Diagun IV scanner does not support.
（2）. X431 V comes with much more language than diagun.
（3）. X-431 V 8inch supports special functions like gear learning, immo key programming, diagun IV does not support.
3. Launch Diagun IV vs. Pro Mini:
Function: same
Diagun IV: looks like a mobile phone
Pro mini: looks like a tablet.
Price: Diagun IV is more cheaper than Pro mini.
4. Launch X431 V vs. X431 V+:
Function: same
Size: X431 V 8inch X431 V+ 10 inch
Price: X431 V is cheaper
Difference:
That’s no difference if you don’t have heavy truck diagnosis.
X431 V+ & HD model used for heavy truck diagnosis.
5. Launch X431 Pro Mini vs. Pros Mini:
No difference.
6. Launch X431 Diagun IV vs. Snap-On Verus vs. Autel:
Launch X431 Diagun IV has the full bidirectional control capability.
There is nothing the versus scan tool can do that the Diagun cannot.
Sometimes you need a power Arsenal.
Turn on time:
Snap on =1:21
Launch X431 Diagun IV:
Real similar a mobile phone
Not bad for the cost.
Best portable scan tool for auto technician and mobile mechanic!
7. Launch X431 V vs X431 V+ vs Launch X431 Pro Mini
| Launch x431 scan tools | Launch X431 Pro mini | Launch X431 V+ | 2017 Launch X431 V |
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| Operation system | Android | Android | Android |
| Screen size | 6.8 inch | 10.1 inch | 8 inch |
| Resolution | 720*1280 | 1280*800 | 1280*800 |
| L*W*Hmm | 205.2×110.7×40.0mm | 276×206×55mm | 210*125*8.95mm |
| Weight | 0.5Kg | 1.27kg | 0.33kg |
| Processor | 1.3GHz 4 cores | 1.3GHz4 cores | 1.0GHz4 cores |
| Cache | 2GB | 1GB | 1GB |
| Hard disk | 16GBSupport a 64GTF card | 16GBSupport a 64GTF card | 16GBSupport a 64GTF card |
| Battery | 3000mAh | 7000mAh | 4200mAh |
| Communication | wifi/4G module | wifi/4G module | wifi/4G module |
Enjoy!