Sims 4 Builders....

I like Deligracy, James Turner, Plumbella & Vixella YouTubers.

Sydney Macoretta is quite cool! She does build challenges almost every other day, although she uses a lot of CC which might not be up everybody's alley.

Deligracy (on mute - the mangled Australian/american accent is annoying) Plumbella, lilsimsie and James turner

Id add to those DevonBumpkin for more regular builds and The Sim Stream for crazy flights of fancy builds.

Bear & Bun - super cool tutorials and builds with mini macinima stories using them
Kate Emerald - epic speed builds and tutorials
Sarina_Sims - modern no cc builds and tutorials
Schnuck - amazing, very creative no-cc lots and tutorials
SIMSTOPIA - no-cc build and tutorials
XFreezerBunnyX - stunning no-cc builds & simdew valley series

hiphiprenee on youtube is my fave!! She's a smaller channel but excellent. She has a video line where she discusses a murder mystery while building their homes (like Lizzie Borden's house for example). All these are done tastefully of course. Plus several how tos and tips videos

I like Simlicy. As a non-native speaker I understand her english very well, that's the priority no 1 for me and I like her builds. I'm glad, that she's back from her maternity leave. Honestly I know more international simmer than from my own country. Hearing hyperactive simmers (most of them) in a foreign language is already bad but nothing compare to hear them in your own language.

What kind of builds to you like?
Out of those not mentioned, I like Harrie (highly detailed builds, some with CC, some without, often uses MOO) and DevonBumpkin (highly detailed builds with character, but not much CC).

Plumbella, Stephosims, Pleasantsims, James Turner. I don't watch Stepho or James very often because they tend to be quite loud fairly often and I'm a Night Shift person so when I'm up watching youtube my family is asleep.

I don't follow any, but I have noticed that Kate Emerald knows a LOT and can do some amazing builds.

I have watched a couple of her tutorials although sometimes she speaks a little fast for me. :D Of course, the beauty of youtube, though, is that you can rewind, rewatch, pause, all of that.