This is just my opinion: but if you have gotten by for three years without a QA, and you are now thinking of getting one - think a little about what you really want to be able to accomplish.
If you go with the Kubota QA you will pay something like $250-$275 for it. You will be able to just use your existing bucket - and if you want a different sized bucket - you can just get that from Kubota (there's a 54" and a 60" bucket available from Kubota for the LA504 - and there might other bigger ones that will fit). A bucket from Kubota is around $575.00. You can use the Kubota forklift frame - which runs around $650. Any implement above and beyond that - grapple bucket, etc - will pretty much cost the same whether or not you're getting it setup with a skid steer type QA or Kubota LA504 type QA setup to go on your tractor.
If you go with a SSQA on your
B3200 (LA504) - you're talking about a much higher cost up front to just get the adapter onto the loader - I believe that an ATI SSQA for the LA504 is around $800 or so. Then you need to get a bucket that will attach to it. You can either get from from a vendor (or maybe find one used) - but as price point I know when I priced out putting SSQA on my
B3200 - it was going to be another $2000 to add the QA onto the loader - and get a bucket that would fit.
To state it simply: it's going to cost a LOT more to add a skid steer QA onto the
B3200 than it will to go the Kubota route.
AND the SSQA weighs more and extends the bucket out even more than the Kubota QA does. So you're looking at an even bigger loss of capacity if you go down the SSQA road.
The cost of a forklift frame for SSQA is roughly equal to the Kubota frame. Although you will have to shop carefully because you may end up with a much heavier frame than you need if you just choose a random SSQA compatible frame. The LA504 is only going to lift around 1000 pounds - getting a frame that will do 4000 is a waste of metal on that loader.
The only major drawback to the Kubota QA over the SSQA in my opinion is that you need to get off the tractor and change the lower pins to lock an implement on. And the thing can be a bit ornery to get the pins lined up sometimes. I have a mallet that I use to get the pins in - and it helps the jiggle the implement around when putting them in. This means you need to have a little bit of strength to change stuff up. If you've got strength issues - then the SSQA might be the better route because it will line up better every time - you'll only have to manipulate the locking mechanism every time you swap something out - not screw with the lower pins like with the Kubota QA.
When I heard the price of the SSQA solution on my
B3200 ( and I already knew about the weight issue and eating up lift capacity issue) I decided to go with the Kubota QA right there when I ordered the tractor. I figured for the same cost as a SSQA - I could buy a grapple and a forklift frame.