I'm like @Cielle with regards to update frequency. I can't follow comics that update, like, 5 times a week. I'd rather they do fewer, bigger updates. 3 times a week is the max for me.
On topic, it really depends?
Example of "full color and love it":
Wormworld Saga. Superb art, wouldn't be the same without those colors: vibrant and beautiful most of the time, but they can also pull off muddy and less vibrant when the scene calls for it.
My current comic also falls under this category, speaking as a creator. It has a visually rich fantasy world that's best experienced in full color. The main character experiences that world as a newcomer, so everything is a sensory wonder to him. Even though world exploration isn't what the story is really about, it's still a big part of the story. Plus, the colors allow me to try some really neat things with subtle mood depictions.
Example of "monochrome and love it":
Alone is one of my favorite comics! It's B&W plus red spot color. The visual focus is always very clear. The art is very easy to follow, never gets confusing. And the art being B&W works well with the type of the story they're telling: honest, unglamorous, unplugged.
Lackadaisy is an example of a monochrome (sepia, not B&W) comic that just looks really really good!
I also want to mention my previous comic, with a gritty urban fantasy setting. I made it in B&W, and would choose monochrome if I were to redo it. The story was slow, dark and personal. Color would've been a bit... distracting IMO, for that particular story. I mean, there are some depressing/dark stories that work really well in full color, but this particular comic wasn't one of them. Monochrome all the day, except for the occasional color pages for impact.
Example of "full color, might look better as B&W":
there's this full color comic with really good art. The coloring is good, but the lineart is on a whole new level. With that particular comic, I wish they didn't color the lineart. While the color helps me recognize the characters instantly, the lineart is just that good. I can appreciate the lineart more when the color is not there.
Example of "B&W, might look better with colors":
no specific examples I can think of at the moment, but I know I've seen some. Some comics have B&W art that looks really unfinished. B&W art (or any art, really) that lacks depth and focus is liable to lose my attention.