My favorite was Markarth, which is weird because I've not seen many others like it. I thought it was laid out nicely, as well as all being on one floor.
My favorite of all is Severin manor, or whatever, in the Dragonborn area. This is because its all one floor, nice and roomy and has a forge/anvil/all the weapon improving stuff and everything inside of it. I solved the lighting problems in it by pickpocketing guards torches, around skyrim at night, then dropping them behind stuff here and there in Severin manor. I've also decorated with things on top of barrels and here and there, to lighten things up. I'm on the XBOX 360, so this can all be kind of difficult (I don't know if they PC version ever came out with mods to make object placement easier.) I have all the bugs in a jar placed upon those haystacks, upon entering, for instance.
Hearthfire homes seem like they are too big to me, with too much running around from alchemy to enchanting and then to smith something. I only like them because I have Ysolda (my wife) at one, with a couple of adopted girls and a bard. I developed the other two manors, but only go to them to get the respawning plants and junk. All of my smithing/enchanting/alchemy stuff is mainly at Severn manor (the dragonborn house you get)
I like how the hearthfire homes come decorated, once I went through the workbenches (being too impatient to wait for the stupid stewards to furnish them...) I chose the different north, east, and west wings for each of the three; That way I saw all possibilities and can visit each for whatever (like one has the kitchen, while another house has whatever the other options were.)
I also like how the hearthfire homes seem to have fairly PERM objects; I knocked over some stuff in the basemant during the skeever occupation, upon revisiting later all of those jars/plates/pitchers whatever were back to the original positions. So these homes seem nice in that aspect, though I've heard decorating with your own stuff doesn't work as well.
Being able to pick which trophies you have, in the trophy room of hearthfire, is cool.
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The cost of buying the materials in hearthfire is moot. I'm on the XBOX 360, with no exploits used. I'm at 765 hours played
and have 1,700,000 gold or so. I actually did pay for the steward to do it too, but they take too long. I did have the
nice surprise of running out of materials, needing to get more, then finding that those items were indeed done
by the steward by the time I got back.
Money was easy once I did the perk tree that gets you to find more gems in treasure chests/urns, as well as giving
vendors more money.
Buying stuff from vendors is just a way for me to launder my thousands of precious gems. Buy them out of iron ingots, goat whatever, glass, straw etc, then sell them gems for the gold they now have from me.