both the TX and Pro sport are very capable rifles.
The only thing I'd add to the above comments are the fact that both rifles have a different balance. The TX is more nose heavy. This suits some but not others.

If you do plan to shoot targets at further ranges in the future or if you think you may wish to try to try FT / HFT I reckon .177 would be a better bet calibre wise.
Either calibre will dispatch any legal quarry with ease.
Both will be fiddly to load in .177. The breech loading cut out on both makes access a little tricky. The port on the HW97 is more accessible but the two you mentioned are a better "out of the box" rifle.