[JensR]

I have tried and worn out the "Toward Pro" 995 (several actually).
Extreme slack in the gear and the known overshoot problems after a few hours of operating my grader.

I cannot comment on longevity of any of the following servos, as I have not yet used them in earnest yet:

The 996R is supposed to be the improved version with better electronics and better gear quality.
In my small test, the overshoot is improved, but still not perfect.
Overshoot is not a problem if you move the stick slowly or limit the servo's speed in another way. So you might argue that this is a problem for aerobatics, but not trucks.

The 946R is a high-torque version of the 995 (I assume it might actually be based on the 996R).
It's still plenty fast for trucks and machinery.
Strong overshoot (see above).

The best budget servo is IMO the hexTronik HX12K. It might not be a full digital servo, though: If I switch my transmitter off, the 996R and 946R hold their positions, the HX12K does not. (and neither does the 995).

The 946R seems to have the highest torque, the others seem very similar to one another, IMO.