I'm a big fan of both of these places. I was at Ramon's for the first time about 2 weeks ago and I absolutely loved it. If you read my post entitled, "Rave Reviews for Ramon's" you can get details but in short, it is a beautiful place with a lot of character. On the last night of our vacation we took the water taxi to Mata Chica and had dinner at Mamba restaurant. While I didn't have an opportunity to walk the grounds extensively or to see a room, if the restaurant is any indication, this place is spectacular. I think it's maybe a notch or 2 up on the luxury scale from Ramon's but as we say often on this board, it would depend what your expectations are. Ramon's is more than comfortable, especially if you have a honeymoon or presidential suite. If you have a "regular" room at Ramon's don't expect more than a clean, comfortable place to rest your head. The beauty of Ramon's is outside of the actual room-- the grounds and the people. The food isn't great but it's decent and there's always a lot of people to mingle with at the Purple Parrot (Ramon's bar) or by the beautiful pool.
The important thing to know about Mata Chica is that it is EXTREMELY isolated. As I understand it, you have to take the water taxi to get to San Pedro, maybe you can ride a bike but I'm not sure. The water taxi is fun for one night but I'm not sure I'd want to do it regularly. It was a little scary at night, riding in a tiny boat in the pitch black. But, because this is a honeymoon seculusion/isolation may not be a bad thing. I personally enjoyed being closer to San Pedro and having the opportunity to try many different restaurants and getting the flavor of the place.
I did not see Victoria House but I've heard nice things about it.
Let me know if you have other questions.