I would say play with both. Either will work for even the smallest game. Both are fun to shoot.
I will say I've used the 350gn speer to take a deer with mixed results. My first shot, I hit high on the spine and the bullet actually splashed instead of putting a hole through the spine. my 2nd shot was high through the lungs and it put a fist size hole through and the shock severed the spine and almost ruined the tenderloins.
I was very surprized the see a 350gn bullet splash on the spine of a deer but with the TSX, you won't have that problem. I pushed it to 2550fps.
For the cheapest plinking go with the 350gn speers or a 400-500 gn cast
