All of mine have been manual
IMO. They are stronger aka sturdier and less problematic
If your RV is so tall that manual is a problem to use
Or
There are health reasons to use the electric
Then that is a choice
I have never had electric, I can't say which one is best
I think it is the proliferation of slideouts , that have made electric so popular, and in some cases the only real user option
A manual awning would need to be extended and raised for clearance before putting out the slides, unless it was attached to the slide instead of the RV roof line