@dwpc, as others have said, definitely a foam vest. Don’t bother fooling with the air vests.
As far as which vest to purchase, I’m just going to say that over the years I have owned multiple different vests of different brands and styles.
Charles Owen may have changed their design since I last bought one from them, but that was a vest I found particularly stiff and uncomfortable and unsuitable for everyday use. I still have it hanging in my tackroom, barely used, collecting dust.
Tipperary is far and away the most ergonomic vest I have found for every day riding. It is comfortable and flexible from the moment you put it on, easy to wear for every day riding, cool to wear in hot weather, and easy to fit under a winter coat in cold weather. Tipperary has a lesser safety rating because the vest design does not protect thoroughly against penetrating injuries. For example, if you fell on a spiked log, it could theoretically penetrate in between the foam pieces. Body protectors that are a “solid” piece of foam give better protection from penetrating injury, but are also more uncomfortable to wear.
My advice: measure yourself and order a couple different brands, but definitely include trying a Tipperary (free shipping both ways from Smartpak). Consider ordering different sizes as well, sometimes a vest that seems to be the right size actually ends up a little too long in the back or pinches at the shoulder, or whatever. Just suck up the costs of sending vests back and forth if you have to, fit is very important.
Because ultimately the BEST vest for YOU is the vest that is comfortable and ergonomic for every day use.
If you were an event rider looking for a vest that you would only wear for cross country schooling, I would give you different advice.
Last point–certain brands of vests fit men and women differently. When ordering, consider checking or inquiring about fit for men. A brand of vest that is a favorite with curvy women riders may not have a great fit for a male equestrian. I have several male relatives who ride and train and use the Tipperary vests–they fit men well.
Disclaimer: I don’t work for Tipperary or for Smartpak.