fav way to make money?

Any way that allows me to play with my sim still, usually working from home.

Painting is my #1. In previous games, painting raised fun skill and Sims always want to paint anyway, so why not let them?

For quick cash in an emergency, I send my Sims running around the neighborhood at home to collect things and sell them right out of their inventory.

My Sims almost always have regular day jobs, but those are my favorite (and favorite super-quick) ways.

I don't really have a favorite way, I do whatever fits with my Sim. Some work hard at their career. Some do lots of "freelance" stuff like painting, or collecting and selling stuff they find, programming, or playing instruments for tips. Some marry wealthy Sims or have people move in they can live off of. My last Sim actually just moved in with Judith Ward, killed her, and then used her assets to live off of.

The one thing I never do for my Sims is cheat. I do occasionally cheat if I'm setting up a townie's story, to get them where I need them to be, but not with the Sims I'm playing.

I like gardening. I used to have my sim sit there every day and write bestsellers, until I discovered that selling harvested flowers each day yielded many more simoleons, with fewer hours of effort.

I feel like my favorite is the one I use the most which is painting. I enjoy having sims paint and it’s a good money maker. I also really enjoy the freelancer careers as a good way to make some extra simolians.

I really enjoy painting. I like that you can see the finished product.

Depends on the sim for me painting or writing if they are creative usually. If they are opportunistic I might make them a painting club and they socialize and sell other's work.. Gardening isn't as lucrative but it's not bad when it starts going. Collecting isn't too bad for starting off. If they are evil they move in a sim and do away with them (keeping their money)... or black widow around. Fishing can be good after getting skilled at it.
Most other sims just go to work and get ahead slowly.

I like the idea of creating your own things in the diy table or any other thing that is made by yourself like photography, crafts, baking and then selling them in your own store. I think that is the most realistic and great way to feel that money is hard to get. A d it fixes the idea of getting money by going into the rabbit home job or the repetitive doctor,scientist, police job. Or you can be an archeologist and sell your finds from selvadorada.

Yard sale. :p

I love doing this for sims that work from home and I never sell things form their inventory, so I always have them sell things they find or make. One of the most useful items from City Living and Jungle Adventure. Had a sim have a bake sale and just sale plates of cookies and brownies. Not overly lucrative, but enough to help a sim that's a stay at home parent to make an 'okay' living.

Writing. It takes a bit to set up, true, but Screenplays, Science Fiction and Mystery all have really good returns on Royalties and those royalties keep coming in for 20 days after publication, so you can take a day or three off on occasion- unlike with gardening - especially if you write several in advance and then just publish them each day. They only take about 4 sim hours to write.