I will say it all depends on how much of each you are putting in there and what your cleaning regime is. I have found 2213sc can carbon foul a barrel quickly and letting that happen can ruin a barrel quicker than if its kept of top of. But 2209 is faster burning and probably "hotter" in the throat area, where 2213sc will burn further down the barrel. My limited findings, Im only on my first 284S barrel and using 2209. My findings on 2213sc is based on the 260 improved with 140gr bullets.
If looked after properly I believe both will last a quite a while.
2209 may be faster and hotter (just) but you also use less of it. I have seen plenty of 284's make 2000 rounds plus on first chambering (some quite a bit more). This is the most widely used powder and it has great barrel life.
I have used 2213SC solely in a couple of barrels that loved it. 2 of them are around the 2000 mark as well and have just been rechambered. They still look good but I take care to remove the carbon whilst still warm.
To manage carbon I use JB or iosso paste on a stiff nylon brush. Some solvents will help with carbon- especially when used while the barrel is warm from shooting. But generally I have found when its gone cold its pretty hard and most solvents wont move it. There are alot of dedicated carbon solvents sold that arent worth the label printed on them.
I was shooting today and a club member had his 223 going next to me. Later he asked if I could help out with it as it was spraying high and low and everywhere. After 10 shots I retired it to the bench and put a few patches down it with hoppes 9 as it was all I had in my car. It was easy to feel the carbon in the barrel, about 20 inches was rough and restricted, while the last 10 or so inches was very smooth like it should be. He had some JB paste so we got into it with a nylon brush and the JB and a bit of hoppes mixed with it. Alot of black "toothpaste" came out. We patched it out with more hoppes and immediately you could feel the whole barrel from chamber to crown was very very smooth. Back to the firing mound it took 4 shots to settle and then those little 80gr sierras just hunted the X ring down something cruel. Too many times Ive been caught out by carbon at the worst possible time so I make a very stern effort to keeping on top of it.