Should I re-roll for a random champion?
I have shards for Aurelion Sol, Kennen, and Xerath right now. I can disenchant aurelion + kennen to unlock xerath, or aurelion + xerath for kennen. (I can't unlock Aurelion.) The thing is, I'm just not that enthusiastic about those champions, since I've heard that they're not so great. I'm low-level, but willing to pour the time into learning a harder champion; however, I'm worried that the champion will end up being under-whelming and I'll regret unlocking them and spending time playing as them. So, should I unlock one of them? Or should I re-roll? I just really don't want to get a 450 champion, because that would suck.
For some extra info: I always thought I would enjoy playing an agile, bursty mage; but it turns out I like to be kind of tanky, too, because I hate being squishy. I ended up maining poppy, because her W makes her more agile, and you can build her really tanky. I have no idea if kennen or xerath would be a good fit for me.
ANY input would be greatly appreciated, even if you say something short like 'don't get kennen,' or 'just re-roll.' I'm really stuck here :(