I think right is better in this situation. Mobility can be nice, however its much harder to aim a 2-far attack.

Left is comparable to alchemist, remove the heal ability and the fact that poison is magic (unblockable), add the destroy instead of poison... and a unit would be around the same cost or +1.

Left: 8 or 9 (likely 9)

The one on the right, is kinda like a necromancer but it can target champions
it can also be seen as a ranger+++ minus kingmove's attack
Lastly you can compare it to apprentice+++, remove the unblockable and swap but add in ranged and +1 cost.

Right: 10