I think the 3 weight would be more fun of the 2 you listed. I have a 2 and a 4 and would definitely use the 2 for gills any time. Between the 2 you are considering, I'd stick with the 3 wt. myself unless you fish in a lot of wind. I'd even suggest a 2 unless you do have frequent wind over 10 or 15 mph, then go with a 3 weight. The 4 is overkill even on bigger gills, IMO. Still fun, but if you are looking for something to "be more enjoyable catching bream this summer" then smaller is better.
Better to be an active environmentalist than and environmental activist.
FFMIRSWTNBOF (Full Fledged Member in Raunchy Standing-Within The NBOF)