I do prefer Barnes (Expander MZs/XPBs) just because i have used them for so long and they always worked. I have had a couple Spitfires fail to expand though in media. This year i used the tipped 458 SOCOM bullet and it was flawless. Massive internal damage and a nice pass through.

They have usually been a bit more accurate for me vs the Partition but thats just because i shoot more of them Ive got a nice stash of Partitions though from Wideners and shooting them into media they are outstanding performers. I hate wasting them on paper. :P