On spec, both should be relatively easy to drive. However, just because it is easy to drive doesn't means it won't improve upon amping. As I said before, some headphone benefit from big current reserve, and you can't tell that from spec. You will have to try it out to find out. Some amp also have coloration that might be favored by the user, like the bass boost in E3 and E5.

I belive IM716 would benefit if amp with E5, to provide IM716 power and much needed bass

You can use it with M3300, but since M330 already has its own power amp, all E5 will do is making it slightly louder.