Flying a spinnaker is a lot of fun. Especially on a beam reach.
Rigging the boat for a symmetical spinnaker takes a bit of hardware.
First a pole with a bridle on top and one on the bottom, a padeye on the mast, a line to raise the pole and one to hold down the pole.
A asymmetrical can be flown without a pole. The height of the tack is adjusted by a pendant through a block on the bow.
Both require a set of blocks all the way aft near the rail at the stern.
There's a learning curve on each one, of course, a little more so on the symmetrical.
I'm fairly experienced on the symmetric but I decided to go with the asym when I rebuilt my 25 (thinking that it would be simpler and easier to fly and it probably is) and I've only flew it a few times. It's going to take a while for learn this one.
So far I still like the symmetrical. I think because I know it better.
Either way they're worth considering. Once you learn how to fly them, they're a gas. But you need a extra hand or two. They can be a handful launching and retrieving.
Rich