My unhelpful comparison point of view.
Keeping in mind I’ve only read volume one of ぼっち, I’d say the two series are different enough that being by the same mangaka doesn’t mean anything. Sort of like going from Azumanga Daioh to Yotsuba (if you’ve read those).
| ぼっち | カラーズ | |
|---|---|---|
| Characters | Larger, varied cast. | Smaller, simple cast. |
| Story | (I assume) overall story that steadily moves forward. | Random event with no overall plot. |
| Humor | Packed with punchlines (one every four panels). | Slow-paced with more childish humor spread out. |
| Art | Simple, basic backgrounds. | Ueno, Ueno, and more Ueno |
Aside from that, I nominated it, so I’m biased toward it =D
I do think the whole first volume is enough to get a good feel for if you’d like it. I’d say the first three chapters may tell someone is they’re not interested in reading the series, but a few more chapters may be necessary to determine if you are interested.
Not really anything to keep me hooked or interested.
remembered it wrong 

