I know what you meant. Ram barely needs heat spreaders, its just not an issue. Micron ain't stupid, they use the best chips on their sticks. I've got 2 Ballistix DDR2 kits here which have been stressed to hell and back, and have come out the other side smiling.
The OP would be happier with either tbh, but crucial get my vote. And even if they do break, you got a life time warranty and they go back to a UK address. So it don't cost you more to RMA than it would to buy a new set.