You seem to be hinting that you'll be living aboard
, or taking long trips. That, and what your lifestyle is are pretty key to your decision making.
As noted, A 45' powerboat, of pretty much any configuration, is going to have dramatically more interior
space than a sail boat of equal size. Start going aboard some for sale
and visualizing yourself living in the space.
I would generally say that if you're considering moving to sail out of cost concerns that you should probably stick with power. Sailing is fun and tremendously rewarding, but it comes with it's own laundry
list of complexities and costs. And a 45' sailboat is a lot to handle for novice
sailors. There are forces at work, with that much sail area, that can lead to serious injury if you're using it as a platform to learn on.
I would argue that the amount that coastal sailors motor is a function of their schedule. If they are transiting along the coast and need to be somewhere by X date and the wind
is not cooperating, they are going to motor. If they have some latitude in their schedule, they are going to sail. I only motor when I have to.
As a cost data point, I moved my 40' sloop
from eastern Connecticut to Annapolis
a few weeks ago and due to schedule and a persistent SW wind
motored almost the entire stretch. I burnt @ $175 worth of diesel, about 1.2 GPH.