Hey,
I guess your partly answered the question already...
Different trikes with different wing/engine configurations can be
quite different to handle in different speeds. Recommended speeds
ranges are individual. And yes, there can be a difference between
45 and 90 knots. Largely depending on your configuration and
power/weight ratio.
Faster wings are smaller in area and perform faster with more
precise inputs. But usually still are quite comfortable to fly
throughout their speed envelope. They wont stall very
aggressively anyway, thanks to Trike's general design; The
Rogallo wing.
(You might want to google that for details about the wing shape,
stall characteristics etc)
When it comes to cross wind landings, learning basic maneuvers
etc. There sure are easier and more difficult wings to learn.
Even still, all of modern wings can be mastered with a good
teacher and fair amount of hours.
I recommend to go and take a trike ride with an experienced pilot
or teacher.
He / she will demonstrate the flying characteristics, it is the
best way to get the hang of it.
Cheers,
Toni