The number of frets on an electric guitar makes a difference because of scale length. The scale lengths are different and you will see that their respective scale length affects string tension.

If you want your guitar to sound good then you need to keep your guitar properly intonated so it is in relative tune to itself. To check your intonation you need a tuner and you should do one string at a time.

Because musical equipment isn’t cheap, it is a good idea to try out as many different amp and guitar combinations within your price range as you can. A bad amp can make a good guitar sound bad and a good amp can make a bad guitar sound good.