I've always liked Lina as a good nuked. If you are good at landing her AoE stun she will wreck you 1v1 once she gets lvl 6. She can 1v1 great until late game where you need an Aghs to keep that Ult damage up, plus her Passive helps with right clicking if they get off a late silence and such
After playing both Skywrath and Zeus in two back-to-back games, I think I can say with certainty that I like Zeus a lot more. His mana cost is a bit higher, but after getting a bloodstone you can use his ultimate to killsteal like a bastard and charge your stone.