In essence the bigger the raptor the faster they are.
I have a 74 GB raptor, and 2 7200.10 Seagate 320GB drives. The seagates beat my 74GB raptor at every benchmark I have thrown at them.
Also at work I have 3 7200.10 750GB Seagates in an USB enclosure. I am able to capture uncompressed 4:2:2 SDI video to these drives over USB. This should only be possible in theory, but they are fast enough to make up for it somehow. I have succeeded in capturing over 30 minutes straight, and could probably do more if I had the time. When I formated I used the largest allocation size availible for NTFS, 64KB, since I was only concerned with big files, and this helps with large file transfers. Nonetheless the 7200.10 far surpasses my expectations.
So the performance may vary depending on application, but in general any 7200.10 > 36 or 74 GB raptors. Only the 150 will be them, and not buy much.