Topping NX1s vs FiiO A3

Hello everyone! I would need a portable amp that has battery, to connect to the xbox controller. I have a pair of Akg K371. I took a look at the nx1s topping which seems to be right for me, for only 40 , but i can go even further up to 100, perhaps finding something more performing. Obviously i don't need a DAC, just battery powered amplifier. Other alternatives to nx1s topping?

Will the Fiio A3 work? I had it for a long time and I remember it being quite good. No measurements that I know of though

Damn I wish I kept mine then