I personally like shrinking to be between 6 inches and half an inch. Anything smaller doesn't usually allow much interaction besides unaware (which CAN be done well, I only see it occasionally done well) and mass extermination (which also CAN be done well I suppose)
Growing is similar, I prefer any size where interaction between tinies and giantess(es) is possible. Usually between 20 ft. and full on able to eat the planet like a snack size.
Butt, boobs+pussy, feet in order of preference (and any sort of thing tangentially related to those) is all right. POV is also reaaaallly nice.
I like gentle but I'm fine with cruel as well, but the cruel parts usually depend on my mood. (like usually death/torture in unusual ways really depends on my mood. Such as using a stapler on a tiny or something, that shits pretty fucked up and I gotta be in a very certain mood to enjoy/not mind it.)
Favorite artists: too many to include but I'll try to say some. Hakuto, Ochiko, Manzi, Pogojo, Sheela, whoever made this :
http://giantessbooru.com/post/view/186665 , Kispar, etc.
Writers are a bit tougher: Jacksmith, (the rest I cant really remember right now)
Actresses: Megan Jones and Kbella are amazing imo. Cali Logan is pretty good too. There are more but they aren't featured in very many works unfortunately.
I enjoy most scenarios to be honest but usually the ones with fewer people (and more personal interaction) are the ones I enjoy the most (aka city crushing is decent but not my favorite)