Help me to pick! AGM M1 vs vkworld Stone V3 vs DTNO.1 A9

Hello everyone
Please helps me to pick one phone:

1). AGM M1

Main Features:
RAM: 64MB
ROM: 128MB
External Memory: TF card up to 32GB
CPU: SC7701
Back Camera: 2.0MP ( SW 3.2MP )
Display: 2.0 inch screen
Functions: IP68 Waterproof, Dustproof, Shockproof
Bluetooth: BT2.1
SIM Card: dual SIM cards dual standby ( one SIM supports 3G, another SIM supports 2G )
Networks:
2G: GSM 850/900/1800/1900MHz
3G:...

Help me to pick! AGM M1 vs vkworld Stone V3 vs DTNO.1 A9

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