I think it is a matter of what you like more in terms of game material. Personally I liked both games, and there are a few endings in both I enjoyed more then others and one I really liked in each game.
In fairness though I will say that the first few h-scenes in Jewel Knights are forced h-scenes. However, beyond that I think it is a very enjoyable game and one worth playing. However to be equally fair, after pointing out the forced h-scenes at the beginning, I also think there is a little more storyline to Jewel Knights then there is to Do You Like Horny Bunnies 2 (DYLHB 2) if that is of concern to you.
DYLHB 2 is very similar to DYLHB 1 in terms of characters, and so on, so if you have played the first version you might want to try Jewel Knights first and come back to DYLHB 2 later. All of that said, I would go with Jewel Knights even if you have not played DYLHB 1 and still come back to those two games (DYLHB 1 and DYLHB 2) later.
Also, ones I am not sure are on or were on your list but I highly recommend Kana ~ Little Sister ~ and Crescendo, with the warning that scenes in both games reduced many if not all of us that have played them to tears, and perhaps because of this they are excellent games.
[This message has been edited by SCDawg (edited 05-21-2004).]