First off $US100k for a bigger than 30ft multihull
really limits your options, it may be more a case of living with what you are able to find not choosing between a cat or a tri.
Your question is a little to generic to be answered easily. I have been looking at Fboats, the C31 in particular. At first I thought the aft cockpit
would best fit my needs, but after sailing in a center cockpit
I changed my mind.
The center cockpit
put the helmsman much closer to the cabin
top where the winches and cam cleats
are and the traveler was not located in the cockpit
making it seem much larger. Bottom line is any boat can be set up to make solo sailing easier or harder.
I also looked at a Seawind
1000xl and did some reading about it as well. The helm
is much more protected on the Seawind
and if you have a remote
for the auto helm
you can stay inside, but still very close to the main sheet cam cleat. The Seawind also has twin engines which means docking
is much easier for a single
There is no doubt a cat above ~35 feet has a lot more room for live aboard. Depending on design the tri probably draws less water
From a realistic standpoint you may be able to find an older Gemini
at your price
point. The other options are much older tris and cats, often home build, most likely past their prime with unknown layout for single
handing. Any of these boats would require a good survey
and most likely some additional money
to get them into sailing shape. Blue water sailing
would almost for sure require up grades.