Best approach of joining a horizontal and vertical pipe together where one is curved? So far my only progress has been to do Face > IntersectBoolean (union). The intersections at these bending corners do not merge very well and after searching I haven't made any progress. Is there a better/effective way to clean up the jagged corners?

I have meshMachin3 and machin3tools installed if that helps (I still don't quite understand how to use them).

Thank you in advance.
Used shift+n to recalculate normals if you have not, then in object mode add bevel modifier and select as "limit method" in the bevel options as "weight" instead of none.
It looked fine for me with two size pipes with different subdivisions, even on 1 bevel.