There are no labs for 2B03, the tutorials are all online except maybe two that you have to physically go to (which is why they have it scheduled into your timetable)
I didn't take 2F03, but a friend of mine did and I don't think he liked it very much but said it was easy. 2B03 is very interesting, and not too hard. So out of those two I would recommend 2B03. Also I believe 2B03 is a prerequisite for a bunch of stuff where as 2F03 is only for upper year ecology courses (I think?)
Also Bio 2D03 is awesome, fairly easy and has cool labs
Only a prereq for upper year plant biology courses but plant biology is awesome!