The first game is definitely better.  The second one has some cool stage concepts and backgrounds, but it's way too easy!  And it's actually shorter, gameplay-wise, than the first game, by a few minutes, which is disappointing given the move from card to CD.  The first game's really good, probably one of the better HuCard shmups, but the second... it's only good, I think.  And way too short due to the low difficulty level.  Some options, difficulty level choices, etc. would have been great...