Right now I'm using APC wide blade props for 3D flying. I think they are pretty heavy. So I'm looking for some light alternatives. One is a 12,25x3,75 and the other is a 14x4W. What other props can provide the same great thrust like APC but at less weight?

I used a Pro Zinger 14x4 with good results.

i use pro zinger also, i change back and forth to change cg with apc, on my cheap scale there is about an ounce difference on the 15x6

The weight of the APC prop is not an issue --
TheAPC is one of the least expensive props which hold shape while revvingup down
pick the right blade size and the engine will rev quickly
Just because a prop is light -doesn't make it a good 3 D prop.
There is a new clone of the Mejzlic now available in Czech Republic -extremely light - if tthat really is what you feel necessary
I think it is MZ
anyway two letters.
extremely light -look exactly like Mejzlic

i like menzs

Mejliks are now been regarded as "not so good for 3D" and more of a IMAC prop

Mejzlik 3D's Great for me.

I have dreamed about a 12.25x3.75 cloned in CF