better hobbed bolt

Your choice. I went with cheap and simple in design and this more reliable alternative MK8 design.
Be sure to get the one that has pull down handle on the left.
You will save money and it will work better then Titan or DOTBIT. They are both too complex and are no where near as reliable.
Trust me, i have all 3.

Have a look at how simple MK8 design is.

Titan or DOTBIT have advantages. They have gear reduction system. They use less power to pull harder.
Their disadvantage is price, complexity and not easy to use compare to good old MK8

MK8 will get your extruder stepper driver warmer, make sure you have a fan under your robo.
MK8 takes less space and less weight as a result.

Chose wisely.

 

Can you use the Robo extruder motor with the Titan and other extruder?

 

Yes you can. Motors are all the same, its what the motor drives thats different. Titan or MK8 or what have you.