Planeray said..
Having had both while racing (usually with inexperienced crew), I'd have to agree with Donk.
The symmetric does have it's advantages (cheap, as you've got the gear already, better on a dead downwind run etc), but gybing is definitely something you want a bit of experience with. I've done it two up, but we were a really good team and had a fair bit of practice.
Issues with symmetric;
* Setup - my old Soling didn't have safety lines or anything so we'd launch under the main. You needed to be able to figure out which side the pole was going and make sure the halyard was on the right side of the forestay, which led to some dodgy bow work. After that, we'd prefeed the brace, then hoist, pull back on the brace and trim the sheet. All ok, assuming we didn't have to gybe in the meantime.
* Gybing - again, you're sending someone up on the bow, moving an awkward pole about, trying to grab a couple of lines that are under load. Not super easy.
* Repacking - after every use, you really need to run the tapes on at least two sides to make sure it's not twisted next time you hoist. That was really hard in our open cockpit.
What I've got now is a furling assy using a profurl spinex. I'm absolutely still getting used to it - what angles to sail etc. I've also had really inconsistent crew lately, so it's been a bit hard for me.
Biggest issues I've found so far are;
* Setup - One of the things they never address in any of the videos is the full setup. My boat has a full pulpit (I suspect yours does too) with no gap in the middle, so I have to connect the tack going over the top of it, BUT remember to set the furling line underneath. When I pack it away, I leave the sheets attached, as they help it stay furled...of course, when it comes time to set it up again, we have to have an impromptu maypole dance on the deck to unwind them a bit so they can be properly led back to blocks at the stern, then forward again to ratchet blocks. Gotta watch where each of the lines cross over each other too - I've had to re run the sheets mid race after finding the crew had somehow run things under the jib sheet or something equally stupid.
* Unfurling - No matter what they say, you really need to have both the halyard and the tack cranked on hard with the winch, otherwise it just won't unfurl properly.
* Upwind sailing - Maybe I don't have it furled tight enough, but I found that if I left it up, mine would start to partially unfurl and at the very least provide a lot of turbulence. I'm probably more sensitive to this as I race, but now I get the guys to drop it back on the deck after furling and tie it to the stays or something so it doesn't fall overboard.
* Gybing - I've got it set for inside gybes (which are faster with a decent crew). When it works, it's awesome, but it does offer the entertaining ability to wrap around your forestay. Definitely recommend furling it to gybe when short handed. It'll take longer, but much safer.
The problem I see with using a assy on something without a bowsprit (unless you intend to fit one) and gybing on the inside is you haven't got a very big space for it to pass through
Gybing on the outside fixes this but you run the risk of the lazy sheet going under the front of the boat unless there is some kind of sheet catcher on the luff of the spinnaker
I guess one on a furler and furling on every gybe would overcome this but a Furler on a 24 footer seems a bit overkill to me
Regards Don