Well, both are beautiful varieties. I imagine the Silver Moon will appreciate the morning (as opposed to hot, late-afternoon) sun more than the Victor Hugo, but both should perform well. Then again, I'm one of those who plants clematis in shadier, i.e., in some cases less-than-optimal situations all the time, cuz I loves 'em so much. Good luck with these. Gary

I don't have Clematis "Silver Moon" in my collection so I will leave the assessment of it to others who do but I am growing Clematis "Victor Hugo" and he is a dandy,very floriferious clematis..a wonderful pruning group 3!!
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Here is a link that might be useful: Clematis Victor Hugo

Thank You for responding Gary and Jeanne! Love the pic too!
I was worried that these wouldn't get enough sun, being on the east side though.
And how would I go about pruning since one of them is a Type 2 and the other is a Type 3?
Thanks for all of your help. : )

You don't want to mix these pruning types, ideally. In our zone a type 2 (SM) will need a little trimming of dead stems, but most major stems will remain after winter (note: this won't necessarily happen the first 1-3 years after planting while it gets established).

A type 3 (VH) works better creating all new growth each year, so pruned to the ground in Feb/March. A note about VH: it has C. florida in its bloodline, which makes it a bit less hardy in z5. I've lost one well-established plant during a harsh winter.

Thank You michael in chicago! It's good to know that they really shouldn't be planted together...and if I lose Victor I should go with another type 2.
Really appreciate your help.