Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
SOCAL PHRF has concluded after the last several years of ASYM usage by lots of boats that the ASYMs end up faster over all on the race course. They can be single handed with a snuffer, easily used by a short crew, no pole to store, or control lines to accommodate. I would not consider a SYM any more. ASYMs are now coming in several cuts, depending on how close winded you want the sail, you pick the use, they design the sail to get it done.
I purchased my asymetrical four years ago for $1300. Although my long time sailing buddy berated me for it, I've never regretted the purchase. It's easy to sail single handed and very fast. It came with sheets, tack line, and a neat little instruction book. I wouldn't think that there's a major price difference today.
If you use the usual technical definitions it's not a true spinnaker. To me, an ASYM is a much easier type of light-air downwind sail to operate for the reasons listed by Frank.
I just took delivery on a nice ASYM with snuffer made by North. This cost me ~$1000, but included shipping & a nice "turtle" bag. Note that this was a "boat-show" price. Add about $200-250 for sheet & tack lines, deck gear, other assorted hardware. (Your mileage may vary). North has a nice 12+ minute CD on setting up, packing & using the sail & snuffer.
For now I'm going to fly mine from the unused jib halyard rather than mess with adding a spinnaker halyard. Below is a link to a post of mine in the General Forum back in October. Lots of good info from folks on the topic.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.