Can't decide which champion!

So I'm approaching level 30 and I've primarily been playing jungle with some ADC and Support here and there. I'm currently wanting to get a champion for mid/top lane and due to my skin shards waiting in my loot I'm debating between Swain and Heimerdinger. The skin options are either: Alien Invader Heimerdinger Dragon Master/Tyrant Swain If anyone could give a recommendation about which of these two champs are best for learning, have a good skill cap, and have the most pressure in both mid/top lanes. Thank you! Edit: I only have enough Blue Essence for one champion currently.
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