Having tried both Partition's and TSX's in my 25'06 both in 100gr. I found a tad better accuracy in my rifle with the TSX's as opposed to the Partition's. Both gave outstanding accuracy by any measure but the TSX's were a bit tighter, by maybe 1/4" at 100yds.
As for on game performance well I'd be hard pressed to say ill about either slug.
I shot 2 moose, 1 bull elk, and about half a dozen deer with the Partition's.
I've killed 1 moose, and nearly a dozen deer with the TSX's, and well quite frankly they both work, and to date I've recovered only 3 slugs.
1 Partition from a mulie buck shot through both front shoulders at 255yds, and a Partition recovered from a moose hammered at 300yds, while quartering away, it broke the off side shoulder. Both bullets had about 65% weight retention (design retention is 65% with a Partition)
The only TSX I've recovered was from this years whitetail buck and it had an impressive 99.5% weight retention, after penetrating at the least 36" of deer, maybe more if you consider the actual bullet track.
So I guess it boils down to what you find your rifle likes for a bullet, as you can see my experience says both work just run what shoots best.