It all depends on what annoys you the most! Notice I didn't say what thrills you the most? I currently use a OnePlus 8T. This is my 3rd OnePlus phone (6 and 7-Pro) and all three of them have worked without issue...for me! I have also owned 3 Samsung phones...S5, S10e, and S20FE. I had more issues with the Samsung phones in general and prefer OnePlus. HOWEVER, and this is where the annoyance comes in for many is the possible buggy updates, and for sure the slow (always 2 or 3 months behind) security patches on all OnePlus phones. This is a true annoyance for many who use OnePlus. Slow security patches do not bother me as I feel that security patches are way overhyped as something absolutely necessary! YMMV
I think Samsung is better at updates and patches. But Samsung has more bloat apps for sure! So then it all boils down to what annoys you the most, and what you can live with! One thing for sure is this: No matter who you buy from, the phone you get could be the best thing since sliced bread, or the worst piece of junk imaginable. When it comes to something as complex as a cell phone, being manufactured and assembled by underpaid and overworked (slave) laborers, it is a crap shoot as to whether you get a diamond, or a piece of coal!