There is no best it really just depends on your playing style, if you're a aggressive player then e4, I'd you are a positional player then d4 if you're a flexible player then nf3 and etc.
The often repeated, horrible and incorrect advice.
Opening choice should be based on the types of middle games youre comfortable playing. Not based on what someone says is the best first move.
I agree e4 is the best opening. I was losing every game playing d4 now switched to e4 and it's like chess became much easier. Thank you Bobby Fischer for opening my eyes
Best by test
f4 - Bird System, similar to Dutch Defense.
Leads to sneaky kingside attacks. Where all Queenside attacks are neutralized/nullified
Or play a Nimzowitsch-Larsen with Nf3 as the first move. Now play b3. d3 or e3.
"Sharp" is just a word. And focusing on things like that will not make you a better chess player. All sharp means is that its a position that has tactical possibilities, and it needs to be played very carefully.
There is no best it really just depends on your playing style, if you're a aggressive player then e4, I'd you are a positional player then d4 if you're a flexible player then nf3 and etc.