Ya, they definitely are very different itineraries , and the prices are pretty similar. I have travelled Europe extensively in the past, so like I mentioned the ports are more of a background bonus to the actual sailing and ship. Definitely sounds like a plan to get to Venice though, as it is a good time of year, before the summer heat too.
Another question I had was whether to go with a balcony or not? It's obviously a decent amount more, so we're wondering if we should think about it on a longer sailing. I've been on a few 7 nighter's and never bothered as we spent most time awake on deck. But maybe worth it on a longer one? Still think we'd be around the public areas more again though.
Thanks for the help