Done it every way. The best? No question the best is a boat house with a concrete floor. Drive in, unhook block and close the door, turn on the light, and work on your boat indoors all winter!
I know two guys that had them built on their property for their boats and it is friggin awesome. All your stuff is in there. One guys has heat, a small fridge and TV along with his workbench and tools. The other picked up a steel building on the cheap and had a concrete floor poured, has the yard deliver the boat into his house... a I could hang in there all winter.
But for covers....I think the best is to get a buddy that has a shrink wrap machine and you help him. You can do it for close to cost. (about $100 or so)
Also, if you do it right, you make the shrink wrap in such a way that you can untie it and you can re-use for several years (the most I have ever got out of it was 3 years, the least 1 year.. because of birds pecking it due to something that was on it) He built a belt like band into the base and you just loosen the belt and lift the cover off. It works great and if the plastic is not badly damaged it will last for several years.
This breaks down to $30-$100/year...not bad.
The entire frame and tarp thing is a PITA and takes the better part of a day and you spend a lot of time adjusting it all winter. My dad did this on a big fly bridge boat and it was a waste of an entire weekend each winter. I hated helping him cover the boat. (he always picked a freezing cold and windy day to do it)
This year I don't plan to do anything...close the door and that is it. I may tape the pilot house with shrink wrap tape to seal out any blowing snow. I may chicken out and have it wrapped but I as of now I am planning on letting it take the ice and snow.
I do like shrink wrap for most boats. It is pretty weather tight and allows air to circulate and there is a little greenhouse effect too.