For color, I like the look of Vision3 250D, Cinestill 400D, Gold, and Lomo 400. It’s hard to pick one since there’s so many to try! For B&W, I really enjoy TMax 400 though.
I’ve only been able to shoot 1 roll of 250D and 1 roll of Cinestill 400D (I think people say it’s the same minus the remjet) but I really enjoyed the results. It’s pretty cheap to find but finding a place to develop it is more difficult and expensive than C41.
Vision3 500T. It pushes like a dream: 3 stop push metered at 3200 makes for awesome nighttime photos.
B/W wise I love Eastman Double-X at box, or HP5 with a 1-stop push.
XP2 Super - hands down - can use it 100-400 in C41, holds the highlights better than HP5. Swap to xtol, and it's solid up to ISO 1600 with dynamic range that matches HP5.
Shout out for JCHStreetpan 400. I remember finding some pictures people had done, loving the extreme contrast plus smooth tones. Shot a roll and it was wildly under exposed. Now I shoot it at 200 and it's awesome.
For color it's tougher. Gold 200 is pretty freaking sweet. Lately I really love the heavy reds of all this Aerocolor IV that's getting re-spooled lately, been shooting the Santacolor 100 version.
I’ve been bull rolling and shooting 250D and HP5 almost exclusively for the past year and I feel like I’ve gotten to a very comfortable process for both.