I don't have a Kobo Touch so I can't make any suggestions. I do have the T1 & really like it. I really like the dictionaries on it. I use my readers for mostly reading & have found whatever reader I'm using I get used to their interfaces & little quirks.
I'm sure you have been on the Sony & Kobo forums here & learned a bit about them. So in the end you just pick one & go with it. When I got my first reader , Nook Classic, that is what I did. Bu then I got curious about the other readers out there & bought a Kindle3 & then a Sony Prs 350. Liked all of them. I'm just an e-reader junky.
One I never seriously considered was the Kobo even though I tried it at Best Buy.
