In rec.boats.paddle springer wrote:

I am looking to use it for fishing and whitewater. I go to the
following rivers often, the New and Gauley rivers in WV, Maine,
and possibly the Snake this summer. I would like to get a rowing frame
for it, for when I intend to fish.

You will also see Maravia boats on those rivers.

There is something to be said for the Sotar because it is lightweight.
You might end up fishing by yourself. Did you see the comparison chart
at http://creekin.net/rafts.htm ?

The floor of an AIRE raft absorbs quite a bit of water, as you notice
at take-out. It definitely affects use by a 4-person paddle crew.

What's wrong with urethane?

Urethane-coated boats don't roll up as small as hypalon boats.
Because urethane has more abrasion resistance, and is more slippery
than hypalon, urethane boats perform better in rocky rivers.

In the desert conditions of the Colorado plateau and southwest US,
where it is all-sun all the time, plastic boats tend to melt. Most
seams in a Sotar are welded, but whatever accessories are glued-on
start to slip. Moreover, silt in the water and blowing thru the air
damages these boats, despite urethane's reputed abrasion resistance.
When friends take their rafts down the Grand Canyon, the Hysides
come back looking almost new, while the Sotars look worn.

But you do not list such rivers among your usage patterns.

Personally I would not get an Avon because the gray color
looks boring in photographs.