They're both fun, skillshot-dependent champions. Ezreal has four skillshots, meaning it takes a good amount of skill to play him effectively. They're both solid picks, good at their most common role and also flexible enough to play other roles as well. Both are very mobile, hard to gank, and strong in the laning phase.
They have a good amount in common, to be honest - I'd recommend deciding whether you want a pure AP caster or a ranged AD/AD caster hybrid, or what lane you like playing. Try to find them during a free week to try them out, or watch streams/videos of them in action to see how you like them.