Gil, this isn't an exact science. For an amateur photographer, a "good" shot is a shot that you personally are happy with. And if that's the type of shot that you like then yes, a simple reflector would make a big difference and would probably satisfy your needs.
It's very different for a pro who needs to satisfy clients, and to be able to get results that they're happy with in all weather conditions. When I did outdoor fashion-type shoots I'd have either a van or my 4x4 full of multiple powerful battery-powered lights, stands, boom arms, modifiers and so on, and the cost didn't matter. The insured cost came to about £12K from memory. A quick price check shows that the basic AD200 costs £296, the same in AD300 is massively more expensive at £418, and what do you actually get in terms of extra power for the extra £122? Just another half stop of light. The AD1200, at £1512, costs 5 times as much but has 6 times as much power, so is actually better value. You need to decide how much you want to spend, and on what offers the best value for money for your own needs. I'm lucky, I don't need to buy any lights, and it's a very long time since I bought any, having been sponsored by different manufacturers for the last many years, but if I was paying for a light myself I'd be reluctant to spend money that didn't actually need to be spent.
For outdoor use alone I would use the AD200 with the fresnel head... primarily for fill, but also suitable for starker/high fashion type light and other things as well (accent lighting). The bare bulb/reflector would be a bit better, but it is more fragile. I like the reverse fold light stands for portable/outside work; they are more compact and typically have a lower min working height. You can also (usually) set the legs flat on the ground and secure them directly with tent pegs. Also consider getting the remote head attachment for the AD200; it's cheap and will minimise the amount of weight you're trying to stabilize up high.
If you are wanting to use it as primary soft light outdoors, that's a whole other game. That's going to require much larger modifiers (kites) which will require much more stable/stronger stands with a lot more care to make/keep them secured. And I think a single AD200 is a bit on the weak side for that kind of lighting outdoors (when mixed with sun). You can pretty much forget about full body soft lighting with a single AD200 as primary... and for portraits you really don't want anything smaller than about 36"/90cm. All of this becomes much more difficult/involved and is much better done with some assistance.
And that's a very valid point too. I would do the same for a lot of outdoor shots. Choosing the right modifier (and using it correctly) in the studio makes a massive difference but outdoors? Not so much. Again, if the photos don't need to please anyone else you can normally change the photo to suit the available resources, e.g. go for a head shot if you don't have the power for a full length, and go for cloudy weather when you don't have the power for bright sunlight. You can often "increase" power simply by not using a modifier, or by using something like the high-intensity reflector, which I've used so often outdoors
https://www.lencarta.com/all-products/light-shapers/lencarta-high-intensity-reflector-mod009 and, poor solution but workable, you can often also make up for inadequate power by moving the light so close that it's in shot, and then clone it out afterwards.