if its going to be a hardcore trail beater, id go with a steel tub. If its a street truck, mild wheeler go for the glass.
i did my cj5 with a glass tub, picked it up new tub and fenders that were passed between guys for a few projects never finished, locally for $1100 and got a new fiberglass hood of ebay local for 60$. it was nice with minimal paint prep, but a pain to drill holes with glass fiber always in my arms, and well everywhere.... my CJ8 im building now even though its pretty much a rust bucket, its definaly going to be a trail rig and staying steel to beat on......
personally, i would also rather weld than glass.... which i have done my fair share of on model boats and full size hydros...