I’ve always been flying spinnakers on our previous boats but now decided to go for a gennaker instead on our 375GL. I haven’t received my gennaker yet, so cannot offer any first-hand experience at sea, but I’d still recommend you look into that option as well.
Spinnakers today are the same as they were 30 years ago: lots of fun for a skilled sailor but they come with lots of lines and the need for a spinnaker boom and someone on the front deck to operate it all.
Meanwhile, gennakers have progressed a lot in recent years. There are now cable-free furling gennakers that pack small and cover pretty much the same wind angles as spinnakers do, but are much less of a hassle to operate. For an example, check the integrated furling structure (IFS) from OneSails. Basically you just need a small furler device that clips to a bowsprit (or similar point ahead of the pulpit), you hoist the sail using your spinnaker line, and you can then operate your gennaker much like you do your genoa today.
Our 375GL didn’t come with a bowsprit, so I’ve now installed a Båtsystem PT10044 which checks all the boxes for me: a bowsprit with a gennaker attach point, an anchor roller, and a retractable ladder.