Go with the Stainless Steel Full Wrap. I have used them all and am coming from a lot of experience.
The plastic ones will eventually crack if used long enough. The sun will get to them if you have to park outside during the day. If you don't plan on keeping it very long, don't worry about whether it is plastic or steel.
However, stainless lasts forever and looks fantastic.
Don't expect a lot of windshield protection and especially from stones. I've still gotten broken windshields while using the shields. Some bugs will be deflected from the windshield but mostly the hood is protected from them.
Personally, I believe shields are worth the money, although they do nothing for the looks of the vehicle. I am currently using a full front end bra and hood shield on my 03 Trac.
I just hate seeing the paint being slowly eaten away with bugs, small stones, sand, dirt, etc..
David <><