out of Micro ATX, ATX, Extend ATX, BTX which one is the "best"?

Question

sorry for all the questions. never built a computer before. just trying to get some ideas. and help.

*which form factor is the best, in your opinion. and why.

Answer 1

Best is a rather arbitrary opinion type of thing. Anyway, Micro ATX are generally small and don't have as much room for expansion, while Extended ATX is a little too big. BTX is probably a little bit better, but it is very hard to find, so your best bet is probably ATX, that is by far the most common.