Both. I seriously doubt any of these people will end up in competitive play (although to be fair they're mostly Gold/Plats).
top -
zac is pretty obnoxious in competitive, mainly because he is decent in a 1v2 and dumpsters the current meta of "herbivore" top laners (except nasus). he seems to suck in soloq cos there are more fighters+and his ult is a lot weaker
kennen is a great laner that can run top or mid actually, and has great mid team fight presence, falling off late game. this one is great in competitive and soloQ, but is actually harder to play at higher skill tiers because people know how to all in better.
rumble, weak early game, but great team fight control, and has incredible theoretical damage output - good in competitive and soloQ.
riven pretty good soloq stumper due to her amazing laning.
shen is mediocre in solo q because teams cant take advantage of his shitty splitpushing, and hes better off if his team engages, rather than get engaged upon
mid -
zed, ahri are pretty favourable in both competitive and solo queue due to being highly mobile assassins.
kassadin is 100% a pubstar though, and he's not even good at that because most high tier ppl should know how to dumpster his bad laning.
karthus has been seeing more competitive play due to his global presence and late game scaling but i dont think hes gud in solo q.
fizz has been getting popular in competitive, always been great in solo q.
jungle -
j4, ward clearing jumps, great utility, good in comp and soloq.
udyr roaming the entire map really fast, bad in big ass team fights, good in solo q.
evelynn the one "carry" jungler, high damage output, makes the whole team buy pinks, decent at teamfighting with aoe slow and damage.
hecarim can run past wards real fast, good at soloq.
vi making a re-entrance in competitive, excels at skirmishing, must snowball from 6 onwards. has less intrinsic power so not as good in solo q, but her ability to catch a target means shes pretty potent in competitive.
nocturne decent in competitive, good in solo q, can grab people from long distances.
carry - pretty varied balance. in competitive its
vayne, ezreal, twitch, caitlyn, varus, (ashe sleeper op). soloqueue can add draven. twitch is a monster in solo queue. and corki is my secret OP
support - everything but alistar, soraka, leona, nunu and taric.