i have both the 704 glass and 705 glass. I much prefer the 704. I throw the Xcite Squarebills and smaller top waters; Yellow magic and Whopper Plopper 90 on the 704 and it's the perfect rod. The 705 glass is a big difference ( stiffer ) than the 704. I throw larger sq bills and med diver CB's on it.
Hope that helps.
Which one would you throw a 2.5 on?
honestly, I'd throw it on a different rod altogether. I do not like the 705 glass. it's too stiff and I prefer a softer tip when throwing crankbaits. I currently use a Dobyns Extreme 742 to throw 2.5s but that rod is about $100 more than the 705.
the 704 glass would handle the 2.5, but as you stated.. It's on the upper side and you'd be pushing it. I'm a big fan of Dobyns. The 704 glass is one of my favorites and I can't say enough good things about it, but I throw smaller size baits on it.