Here are the stats of an upgraded WWS. Take note of the minimum and avg damage. The deadly strike and chance to cast amp damage are all huge factors.

Witchwild String Diamond Bow: 89-108 damage (98.5 avg), +150-170% enhanced damage, fires magic arrows [slvl-20], 2% chance to cast slvl-5 amplify damage on attack, (1/clvl)% deadly strike, all resistances 40%, sockets (2), rlvl-61

Back in December I had a post and screenshot of my Upgraded Goldstrike asking what I should socket it with (ended up going with shael). I had been using it until I heard from a friend about the WWS. After 1 pit run with the WWS I was convinced it was a faster killer and overall better bow than my upgraded and shaeled Goldstrike.

It also depends on your goldstrike stats too. If you got kick ass goldstrike then by all means use it. A near perfect goldstrike would definitely be 2nd on my list of bows. Only dropping to 3rd at when at clvl 90+ when the WF + to max damage really starts getting nuts. Only problem is a Perfect goldstrike is, in my opinion, the rarest item in all of D2. If I ever were to find one I would sell it. If you had one on USWest ladder I am positive it would go for at least $100 on ebay.

Either way, try them both and tell us what you think. I wouldn’t count on a lot of amp damage if your primary attack is going to be FA. The WWS works better on strafe/multi zon builds. But I would be interested in hearing your results.