I think it depends on the circumstances.. If you are in a match and you know that you probably need to make then you try to make it. If you know that two putts will win the hole... well... you get the idea. In stoke play I always putt the same. Try to make it and leave it within 2-3 feet as I make nearly all of them. I do not change my mentality over a putt in stroke play. I normally will average 27-30 putts per round depending on the number of greens hit. My best score ever was a round with 18 GIRs and 30 putts.