They handle differently cause the weight balance thats on/over the front wheel changes a bit, its something you may notice when you initially do the switch, but after a little bit of time its something that you aren't even going to notice anymore. Whatever is ideal I suppose depends on what sort of characteristics a rider likes in a ride. I myself have longer legs compared to torso making fit a challenge, bikes with short top tubes typically have short seat tubes so I can't reallly ride them cause I cant get the bars high enough where the bike could become safe, same thing with the seat post. So I go for the longer seat tube, 56cm is ideal for me, and that means the TT is typically 56cm as well, so I use a 60cm stem. I happen to like a twitchy lively feeling ride so It works out good for me.

For whatever reason Ive found a lot of bikes in the past and present in shops/stores come with a 10cm stem.