Drawing tablet questions

I hope this is the right place to ask this.

I was considering buying a new drawing tablet since my current one is incompatible with my new pc, no drivers, and I was wondering if there is any real difference between Wacom and Huion.

My main concern is preciseness, my current aiptek tablet had a jitter glitch and I had to be careful about how I held the stylus, I am worried this might be endemic to tablets that use batteries.

Outside of that the only thing I care about is size and price, most have the same about of pressure sensitivity and I don’t care about included software.

One thing I don’t understand is why people would care about a memory card, I can understand it in the big screen type ones, but not in the kind that are hooked up to P.C.s.

Any advice?