Most DIYers can achieve a smoother finish with semi and satin paints/finishes than with gloss. Getting a smooth finish when using gloss requires some practice and good or better---not average or cheap---equipment. A $3 paint brush will leave a streaky finish when using gloss paint, for instance.

I think gloss is better.

I use full gloss (acrylic) with about 4 ox of Floetrol per gallon.
A very good brush (think about $15) is also needed.