I have 2 warmers. One upstairs, a plug in under the counters and one downstairs in my sewing room (which kids are not allowed in). I honestly love a vanilla Better Homes & Gardens scent from Wal-Mart. Can't beat the $2 price tag. My parents do a lot of farmers markets and have gotten me different homemade scents to use with it too. I have enough for years, seriously.
My favorite ever is Rustic Lodge. It is a discontinued one that I got some of when they had a bring back my bar a few months ago. I also like the sugar cookie one, mochadoodle, weathered leather, and hemingway. I don't have any for the holidays yet since I just started buying this summer, but rustic lodge smells like fall to me.
I absolutely love my Scenty!! I've got three going at almost all times, including a couple that come out just for certain holidays. From Scentsy my favorites are Welcome Home, Mochadoodle, and Cinnamint (which is now discontinued I believe). I also really like several scents from the WalMart BH&G line and they are so cheap that I don't feel bad buying one to test it out. I will say that the Walmart scents don't seem to last as long, but again they are cheaper so its not as big of a deal.
Re: Scentsy
I like basically any kind of baked goods type of scent.
My favorites right now are:
Honey Pear Cider
Pumpkin Marshmallow
Buckleberry
Central Park Praline
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I love anything CINNAMON-Y
Cinnamon Bear (seasonal)
Apple Press (new and seasonal)
Baked Apple Pie
Christmas Cottage
ETA: i have a burner in every room, even the nursery which has the Nursery/Baby scent..its nice for like an hour then its get over powering.