I made my first raspberry/wheat brew a couple months back and also struggled with whether I should go the extract route or with whole raspberries.
Eventually, mostly due to ease of use, I went with the extract. My LHBS had it for around $9 for 4oz.
I added 3oz at bottling time and I have to say it turned out pretty good. I didn’t add the whole 4 oz. as I was afraid of it getting the cough syrup taste I have read others complain about on here.
Anyway, I haven’t done the whole berries yet, so I can compare, but I can say I was pleasantly surprised and others seemed to really like it as well. Next time, though, I think I’d add the whole 4oz.
Hope this helps.