Really good 3D work

Yes , you should concentrate on making one game instead of several at same time.
I personnaly i would say make the the FF style game.
It will be less complicated, caus no need for path finding ,
if you have some ennemies walking around or following a premade path (like in FF13 or FF12).
For combat turns based won't need collision also.

Well it's to you to decide, the action RPG can be great, but it will require lot more programming side like you said (path finding, basic ennemie AI, simple collision (based on distance and angle) etc ...

what you can do is mix all that in one game also, why not ?
Somr FF game that have Harvest moon phases also !

Keep it up !