Is it true ? That the lip across the front does not require removal. Only the rubber front bumper tops require removal of the lop

Correct, it actually helps support the FG.

Given your experience, which do you like ? Pros and Cons....

Rubber hands down for a driver. Offers more protection than people think.

I had black AIR fiberglass bumpers front and rear on my 75 914 and I did not remove any metal. Just drilled the four holes front and rear. A rubber bumper top will not sit on top of the 75 front clip. I don’t know about the separate fiberglass bumper top. Metal bumpers will not clear the side metal rubber holders.

Correct, FG you can leave all the metal tabs (even the side ones I believe). You'll want to leave the front metal support for the late bumper alone. It offers a support for both the FG bumper top and trunk seal.

I once really liked FG bumpers. Cheap, easy to paint etc. until one of the 914's I had needed some manual moving via people power. Buddy who wanted to help put hands on the front bumper and gave a shove. You can imaging what happened. FG bumpers are for looks only.

Thanks for the info and tips. I was tempted to go FG so I wouldn’t have to cut the front lip and side clips.
I have the shiner front bumper and rubber top!; I’ll stick with those.