I can't say I know anything about Goblet (besides maybe.. 20? small near the waterfall/pool is nice) but I do have preferences for the other 3. What I consider about lots are proximity to water, greenery/plantlife nearby, and the view. MB distance isn't important to me, since no lot is that far from a board.
Shirogane -
Smalls: 10/40, 14/44, 21/51, 27/57, 29/59 are all good.
Mediums: 1/31, 8/38, 15/45, and 28/58. Shiro's mediums are all good but not great, in my opinion. None particularly stand out.
Larges: 30/60 > 16/46 >>>>> 7/37: My FC house is plot 60 and my personal house is a plot 46 so I'm obviously biased here, but I can't see the appeal in 7/37 at all because it's backwards.I definitely prefer subdivisions for that nice sunset over the water.
Lavender Beds -
Smalls: 29/59!! My original house was a 59 till I relocated, and if it was a medium or large I wouldn't have moved at all. Literally perfect lot, imo. 2/32, 4/34, and 9/39 are all good too.
Mediums: 11/41, of course, and 16/46 are both great. 30/60 is a passable second.
Larges: I actually... dislike all three of LB's larges. 28/58 isn't bad but 29/59 blocks the view so it's kinda meh. The other two I'm just not a fan.
Mist -
Smalls: Pretty much every small in the 19-28/49-58 range is a solid lot, with special mention to the beachfront trio of 19/49, 20/50, and 21/51.
Mediums: 4/34, 6/36, 29/59, and 30/60 are all great. 1/31 was my favorite lot in the zone till the advent of freakishly tall special housing skins ruined the view. Mist has the best mediums by far, imo.
Larges: 5/35 >> 15/45 > 2/32. 5/35 is the only first class large lot in the game, which speaks for itself.