At your weight you have to pay close attention to recumbent weight
limits, generally available from the manufacturer. The way recumbents
are built does impose a weight limit especially on long wheel base
machines. There are bents built to handle your weight in short wheel
base, but not all SWB. Knees are stressed a bit more on a bent
though on the flat routes you suggest this will not be a problem.
To get an idea of the difference ride your DF bike with just the
fingertips on the handle bars and see how much harder you have
to push down with the legs compared to when you grip the bars.
This is principally on hills. Watch the play of upper arm muscles on another
rider going up a hill, versus when they are riding flat. Bents don't
permit arms to contribute to propulsion.