rhm, on 2013-November-19, 03:27, said:
One issue with opener bidding 3♠ over 3♥ is, that you will have to raise yourself to game, while partner might pass 3♠ with a doubleton spade and a bad hand for game.
Not necessarily if you don't want to, logically it seems like partner can bid 3S with a min 2551 (declining our invite and realizing spades is an equal or better fit than hearts) and 4C with a max 2551 (accepting our invite and offering a choice of games, cannot be any kind of slam move since we made a NF 3H bid). Of course I just made that up but I think it makes sense.
I agree with you that 15 is the most likely major suit holding, and in those cases spades will probably play better (but not always or anything, esp since we know nothing of suit quality from pard), but I do not think that makes up for the times he has 6 hearts where hearts will almost definitely be better, and the times when he has 0553 in which case hearts will usually play better, even though those are less frequent.
It seems complicated and I think someone could write a book about it. I have no doubt the 2M constructive auctions are difficult since they start so high. Until such a book is written maybe gwnn should just bid a ton of hands in partnership bidding and see what he thinks works best/what his partnership is comfortable with.