Hi Rich
First of all I'm not familiar with the the content of the 2 St John's courses you mention, however, here are my thoughts..... I should also mention at this point I'm a serving State Registered Paramedic and have spent 6 years with one of the Lake District Mountain Rescue Teams.
First of all, ANY recognised First Aid Qualification has to be a Good Thing. An appreciation of ABC and CPR should be a minimum for all.
I wouldn't make AED training top of my list either, unless you regularly find yourself in an environment with one.
Areas to concentrate on, depending on where you plan to be (the woods 5 mins from home or a mountain environment 4 hours from help) and in what group sizes, alone or with half a dozen others, should be (in no particular order):
* Hypothermia & Hyperthermia managment,
* Bites & stings management, think ticks and low level anaphalaxis responses, not just our friend the wasp & nettle,
* Wound management, cuts & scrapes through to more serious lacerations and injuries from the wonderful amount of sharp things we carry
,
* Fracture managment, both with medical kit & improvised kit,
* Burns managment,
* Sprains & strains,
* Basic lifting & handling techniques.
There are plenty of good books out there to help reinforce that knowledge. A personal favourite of mine, depending on how deep you want to go, is "Field Guide to Wilderness Medicine" by Paul S. Auerbach et al. Find it
here
Finally, first aid kits. There's been endless threads on this, with many opinions expressed. I'll let you trawl through them and decide what you think's appropriate. I tend to make my own, depending on where I'll be going. I NEVER EVER go anywhere with a knife, axe or saw WITHOUT my EDC FAK. It sits in a very small tupperware type box, the one with the snap locks on the side and it's approx 4" x 3" x 2", in my possibles pouch.
The FAK gets scaled up depending on location and length of trip.
So, to sum up, any FA course from a recognised supplier has to be worth doing. With the basic skills under your belt you can read around the more outdoor / bushcraft specific ones if they're not covered on the course.
If anyone has any questions, feel free to post & I'll do my best to answer them.
HTH