i dont think any are easier to sell because of the market at the minute but there is a lot of people wanting to buy reseller accounts at the minute because of the "boom" of "make a buck and run" companies that get a small reseller, oversell, get their money, then run and leave the customers.
A lot of people think that if they buy a reseller account they will make a wad of cash very quickly without any work since there are so many sites out there, when the real hosts know this is nowhere near the reality.
I only do shared hosting but Im thinking of doing VDS/VPS but I wont do it until I have a lot of experience with testing it out myself first