Funny you should mention this. Friends of ours, whose sons go to a very litvish yeshiva in Bklyn, just grew payos that fit behind the ear in the last 3 years. (The father does not have them that long.. they are part of his beard).
In the yeshiva my boys go to, its about 50/50. But I doubt its coolness that’s behind it.
The thick tzitzis is largly dependent on if its worn in or out. (I wear them in, my boys wear them out). That seems to be closer to 75% out, 25% in. At least in the Bklyn yeshivos