What is different in 10.6.3 and 10.5.8

Can anyone tell me what I really gain by going to SL from Leopard?
I upgraded to SL just using the upgrade cd when it first was released... that was a disaster as Photoshop just would not run. so everyone advised that I do a "clean" install... same problem and folks here all said, well, you needed to do a "fresh" install, which I decided to hold off on until there were a couple of 10.6 updates... so now that 10.6.3 is here I'm trying to figure out just why I should take the risk again.
I have SL on my new imac and it runs fine, but I don't see it doing anything especially better than Leo on my MBP, but I'm fairly new to mac and may be missing something.
thoughts appreciated.
thanks,
tom

Thanks, Andy... now I really have a headache
It sounds like an awful lot of the stuff is like swimming... under the water and not seen. But I really see no particular performance gain in a new imac (i7 max ram) vs my MBP 2.93ghz 8gb ram ssd hard drive)... maybe I should be happy they are equal given the advantage of the ssd hdd but I don't see any user things different... still.. I know the day will come when we have 64 bit apps and I will really NEED SL but it looks like we are a long way from that.
I guess the only real way to find out is to make an image backup and install SL again and see how it runs... it's a risk of pretty much a whole day's work and I'm dragging my heels
thanks,
tom

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