A bike is a bike is a bike, but that's just an observation.
My back likes suspended single-track vehicles, so that, by default, is my preference.

I'm not a 'bent connoisseur, in fact I'm completely ignorant of the relative merits of the
various brands.
Front-wheel drive just appeals to me, as an elegant way to power a recumbent bicycle
(aren't the fully enclosed speed-record holders front-wheel drive?)
and the recumbent seat is the only type of bicycle seat that I can tolerate.

My Sofrider is relatively heavy, but It's well-built, is holding up very well
and I find it extremely comfortable.

So, BlazingPedals, I assume by your comment that you mean to say that Sun
manufactures heavy bicycles?!

Anyway, the Sun Razor looks like fun... clunky, but fun.
I'd love to test ride it.