The difference between the two plans is the way they handle data.

With America's Choice, data calls are treated as voice calls. In
the past, you could make data calls using only the minutes on
your voice plan. For the last couple year's, though, VZW, has
been slowly cutting off data service for "minutes of use", so
most folks can no longer get on line without paying for a data
feature like BroadbandAccess Connect (BBAC), which costs
$60/month. There are quite a few users who are still able to
connect for "minutes of use", but nobody seems to know why.

With the Nationwide plan, which has been around since November
2007, data is handled as data, and charged as such at $1.99/MB if
you don't have a data feature like BBAC.

I helped a friend switch from America's Choice to Nationwide a
couple weeks ago. He did it because an Internet connection
(albeit a slow one) is almost always available in Extended
Network areas with the Nationwide plan, but almost never with the
America's Choice plan. He kept his same monthly bill, with the
same number of minutes, as he had with America's Choice. There is
no longer a requirement to commit to a new contract when
switching voice plans, either.

The only down side to switching is that if you don't know that
it's going to cost you a very expensive $1.99/MB to use the
Internet with the Nationwide Plan without BBAC you could be in
for a very unpleasant surprise.

I guess the question you need to ask Verizon is whether you can
keep your same data plan when you switch to the Nationwide
calling plan.

Hope that helps.