Would these chineese computers work well with pfsense?
both of them have dual lan and wifi, should i be able to get full speed on openvpn with one of these two?
They might - If anything gives you problems it will the the RTL8111D NICs. Same in both boxes.
You could try it with one before you buy 10,000 units.
Thing to watch with the Chinese guys there is you need to be sure they don't change specs on you.
Some Chinese companies seem to not know the value of maintaining a certain product line more than 5 days yet.