Ok, what are you using it for?
I do not have any experience with either one of those Manners stocks. I have owned the T4 Tikka, and multiple T5As. The T5A is my absolute favorite stock from manners, and I like it better than the McMillan A-Hole and any thumbholed chassis. But I like thumbhole stocks.
If you are a 5'9-6'2 kind of guy it probably won't matter what stock you choose. If you are beyond 6'2 or shorter than 5'9, I'd call Manners and ask them.
I have also owned McMillan A-5 for a long time, and used the A-3 Sporter a lot. For a non-adjustable stock the A-3 Sporter is one of my all time favorites.
I prefer a more square stock in the forend. I have a lot of other stocks that drive me crazy for positional shooting because it is harder to deal with a round surface.