im not sure if this will persuade at all, but i wouldn't recommend getting fake nails at all. dont get me wrong, they look great, but they can damage ur nails a lot =/
iv always found it nicer to have my nails natural in a square shape, just cuz it suits my hands. honestly, before u get them done, i suggest u give it some time to try grow out ur nails by filing and using a strengthener. you'll b surprised how nice they can get.
Gels on your nails don't feel any different from acrylics. The gels themselves are just glossier, smoother, harder, and way longer lasting. You won't see scratches on them, and they won't chip off. The only downside to it is that they're more expensive and your fingernails can outgrow them relatively fast - that's why I get gels only on my toenails, since they grow much slower, and acrylics instead on my fingernails.
If you want your nails as short as possible, then better go with the round shape. It can make your nails look a bit longer than they really are and even your fingers more slender. The square and coffin ones only look good if your nails are long or of medium length.