Well, I am not high elo either, nor am I a top main but......
It depends on what you are into. There are some champs that just stay top and demolish a lane (Nasus, Singed, Yorick, Jax, etc) pushing down towers as hard and fast as you can. Yorick for example can ulti in lane, and let the Maiden and a Zzrot portal be pushing the lane as they tele bot lane and shove bott..... Applying pressure onto two sides of the map at once.
Then there are the champions like Shen and Galio who find their pride and joy comes from randomly making a 1v1 or 1v2 into a 2v1 or 2v2 with their ulties. They also apply a ton of CC and utility along with decent damage.
Fiora and Riven have a lot of mobility mixed with damage and can wipe out teams pretty easy after they get any kind of fed.
Renekton, Fiora, Ekko, and Swain do well as either tanky or bruiser..... So they are a bit more versatile, but normally do best as a mix of both.
Im sure im missing a few here, and those champions can fill other parts of what i said easily..... But in the end it all depends on how you like to play.