Hi Pierre,
I started windsurfing about 8 years ago. My first board was a 145L Freeride, then I got a big floaty Bic FreeFormula with huge fin. My thinking at the time was that in order to make the most of lightwind days, I needed to get bigger sails and bigger shortboards.
My thinking, however, has changed.
I got a 11'8" windsup (longboard) a couple of years ago and this is my most used board by far, sailing Lake Michigan. My windsurfing philosophy has moved from "I can only take advantage of the water in 15+ mph (planing) winds" to "I can do something almost every day on the water, thereby improving my windsurfing." Over the past 8 years, I have discovered two new modes of windsurfing: 1) lightwind freestyle (LWFS), such as backwind sailing, heli-tack, non-planing duck jibe, sailing switch stance, etc. -- check out the
Tricktionary website -- and 2) wavesailing. In 9-15 mph, I can easily do LWFS on a 4.7 sail, thereby improving my sail handling. What's really fun, though, is wavesailing on a windsup. I look forward to the days when the wind is 10-15 and clean sets are coming in. With a 6.0 sail, it's a blast, and it opens up a whole new world of windsurfing. Now granted, for really experienced guys and gals who regularly go to Maui or Baja and can sail monstrous waves on small kits, 10-15 mph on a windsup may not be their cup of tea. But for me, at my stage of progression, it's perfect. Add to this two other factors: I can SUP it any time and I can also practice catching small waves on the SUP. Learning how to time waves, trim the board, etc. in SUP mode helps with my wavesailing.
So.... if I were starting all over again, my first board would most likely be a windsup in the 10'-11'8" range. It can work from 0 mph (as a SUP) to 20 mph as a windsurfer. (Over 20 mph, I'd recommend a shortboard). There are some really good options out there these days, from Starboard, RRD, and Exocet, such as
these found at Isthmus. Admittedly, the one downside of the windsup is that is a very large board and rather bulky on land. But in the water, the length makes a huge difference in helping to stay upwind, gliding through chop in sub-planing conditions, and getting onto waves when SUPing or wavesailing. Plus, with the centerboard, you can sail in just about any wind direction. And if storage is a problem, there are some cool
inflatable options, and some of these even come with centerboards!
Here's a helpful
article on two philosophies of windsurf progression (go to point #4). The first path describes moving from a beginner board to a big shortboard. Indeed, this was my own progression, and I served me well. But the second path describes moving from a beginner board to a longboard with center-fin. I now see what a good long-term investment the second option can be.
If you're looking to get on the water as much as you can, the windsup may be an excellent option!