Doesn’t matter… I’ll just sort it with pipe and trim 
Blending is probably best
If you make your surfaces degree 3X2 instead if degree 2X2 that will solve most of the problems. And for the size of this object your tolerance doesn’t need to be so tight.
I would do it like this:
BlendSrfx.3dm (121.5 KB)
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Ah. That made a very big difference, thanks for the tip. Cutting the shape from the side helped too, I got into a rut with spheres and trying to keep the hole perfectly round.
Thanks again!
Andy