I want to install one of them on my Android phone. But i am not sure which one is appropriate ?

Sincerely!

It is not hard to support XP, isnot it ? In fact, we donot upgrade many working XP boxes primarily for hardware limitations.

Can we enable VPN for specified pages instead of the whole browser ?

Sorry! In fact, it is VERY slow just for visiting Chinese sites. The speed of visiting English sites is acceptable.
Can we improve the VPN speed to visit Chinese sites ?

Regards!

It works but too slow .

I want to install one of them on my Android phone. But i am not sure which one is appropriate ?

Sincerely!

IIRC, the previous opera just has one process.

Regards!