Servo choice is entirely budget dependant. You need metal gears in off-road and preferably a full size servo (not low profile) for durability.
It is also a common misconception that titanium is stronger than a decent grade steel. Weight to strength yes, but not size for size. The problem with a lot of the cheaper servos is that although some advertise metal gears, some still have the odd plastic one, and others have brass gears. Titanium is certainly better than those but an all steel gearset is (for durability) best.
Also the speed, response and feel of cheaper servos tends to lack vs some of the more expensive and better made ones. The motor and pcb quality certainly affects those.
To some extent what you pay is what you get in the long term...
Some suggestions (not exclusive but as a starting point):
Alturn AAS752MG for around £18 will be ok
Absima 1614sg for around £53 are good and durable
KO rsx3 responce HC around £140 sublime and durable
If you give as a budget I can suggest a few alternatives for the range...
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