[BBray_T1296]

-Traction wheel has a lot more traction and experiences less wear and tear over time
-When you buy traction wheels, or if you have to change traction wheel tread ever for any reason (wear, tear, damage, etc.) I find it difficult and obnoxious to cut (it is dense stuff!) (especially to the right length, even with math) and to drill rivet holes correctly (without the rivet tearing the matrial)
-Versa-wheel have only slightly less traction, and wear out after only a few hours. (of on-the-field time) after 2 regionals, they have significantly less traction.
-Versa-wheels are very cheap. For only a couple bucks apiece, replacing them once or twice in a season is affordable.
-Versa-wheels perform better as exterior wheels in a tank drive (in my opinion) because they are more tolerant to lateral forces than traction wheels
-Versa-wheels can't realistically break. traction wheels can lose tread, snap into pieces, or do all kinds of not-so-funny things to your drivetrain if they break.
-Versa-wheels are more suited to high speed robots rather than high traction bot's. The Versa-wheel comes all in one piece, is balanced radially, and looks slick.

Traction wheels are probably the popular opinion, as they have proven themselves.
Versa-wheels have several cons, but also a lot of pros too they also work great if you are demo-ing in high grass with probably-too-muddy-to-demo-a-robot soil)

We used only versa wheels this year (6w tank) and I had mixed opinions of them.
We went to 2 regionals this year, and we had a few good shoving matches against traction and Coleson wheels. Our wheels did well at our first regional, but traction did start to fall off by elims of the 2nd.
I think a combo of both wheels might be a good idea: a 8 wheel drive with 4 traction wheels in the center and 4 versa wheels on the outsides.