I have recently purchased a TX200 in .177 with a lovely walnut stock. I also own a HW77 in .22 which is quite an early model. I definately think the Tx is the better shooting rifle out of the box, but I have played around with the HW77 and it shoots more on a level with the TX200 now. Accuracy is better with the TX but it is .177 so that is to be expected in most cases.
I have found the AirArms to be very low on power, only giving around 9.5 ft lbs. I have shot perhaps a couple of tins of pellets through it but it still records the same velocities.
I am quite happy with both rifles, but I would like to get another Tx200 in .22, or a Pro sport in .22 at some point in the future.