Assuming your stanchions are the original and that your deck may be somewhat soggy, it wouldn't be a bad idea to remove them and judge the feel.

If you think you need them, make sure the deck is solid and not delaminated from the fiberglass; a stanchion will only be as strong as the deck it is mounted on.

If you are going to replace them, Practical Sailor rated Matella Manufacturing's (www.matella.com) stanchions the best. There was also an article in Good Old Boat (www.goodoldboat.com) not too long ago. They are supposed to support 2x the weight of traditional SS tube stanchions.