It depends on the Park with me.
I prefer taking the ferry to the MK. Really builds up the sense of 'arrival' to a different world.
I sometimes take the Mono from the Poly, as i sometimes have breakfast over there at Kona on my 'first day' being in town.
The ferry is always nice..exspecially during sunset ( 'Florida Orange' indeed..!) or in the evening.
When going to EPCOT, i prefer the monorail. Fits the theme of the Park for me.
In the days when Guests could still ride with the Pilot up front, it was a tradition of mine to always arrive at EPCOT in this way.
The view of SSE right in front of you as you cruised the pylons passed it was awesome.
The view of the Park interior and WS in the distance was impressive from that seat, too.
Miss that.
DHS i usually arrive by car or bus..then either take one of the launches over to EPCOT or walk over later in the day.
DAK is usually bus/car only. Not a lot of options there...