That's not what I said - read the second paragraph of my attempt to give an informed answer to your hypothetical question and I think you'll see where my sympathies lie.
All I was trying to point out, is that capitalism alone (say, in a situation where Castro and/or his Revolution hadn't happened) would not make Cuba into a prosperous paradise ... as it hasn't managed to do that in neighbouring islands/nations. Everyone makes a justified hullabaloo about the desperation which makes Cubans jump onto rafts to get to the US, but I would bet you that more smuggled Chinese and Mexicans die trying in any one year than Cubans. Cuba is not actually all that unique, or in a vacuum - it's just one (relatively small) nation among many trying to figure out how to live in the same hemisphere as the US without having to follow the US line on absolutely everything.
I am also wary of pronouncing on whether Cuba as a whole would be 'better off' or 'worse off', since in my reasonably extensive and firsthand experience of what Cubans themselves want, the sort of things I find indispensable(freedom of the press and judiciary, freedom of expression and assemby, freedom to form political associations) were actually NOT on their Big Want List. They didn't necessarily want to emigrate, they just wanted to be able to make a legal living.
