Consistency wise, I would not bother with any of those at all... the bottom dollar ammo for most that shoot PRS would be CCI SV, SK STD, ELEY or RWS Club... then hop up to any of the 'rifle match' offerings, and Tenex, Center-X, R50 etc.
^agreed, and that's because I've used every one of them (including the CCI Green Tag, if that's what the OP is referring to) and have found the same to be true. I'll go one step further-if those were the only ammo types I had on hand, and wanted to go to the range...I wouldn't go. Rather, I'd stop at the gun shop on the way and pick-up a few other types people have listed here before me. Specifically (provided you can find it); CCI Standard Velocity, CCI LR HP, SK Standard, Federal gold medal target, etc. All subsonic. As others have pointed out, it's a good idea to do a little research into what ammo types people have had success with, using the same rifle. What's equally true is that no two rifles shoot the same. Often the same make/model will even show a preference for different ammo types, each and every 22 can be THAT different.
I'll stop WAY short of saying you should be buying ammo based on lots (or sorting ammo, looking for inconsistencies) because you said you're new to it, and have your kids shooting this rifle, etc. Some of the ammo suggestions listed here enter the $30/50+ tax-realm, so I think the first thing the OP needs to do is establish a budget based on how much shooting he/she plans to do, and what the ceiling is $-wise for ammo. I don't compete, and I rarely even post target photos....so my successes/failures are my own to enjoy. For that reason, I seldom go over $10-$12/50. On the upper end, that'll get you into something like SK Rifle Match..which has proven to be an excellent, accurate (enough) ammo for me when I'm wanting to try for some tight groups. I never head to the range without SK Standard, CCI SV, SK Rifle Match, CCI LR HP, SK Flatnose Basic and because my Tikka T1x loves it...CCI Velocitor. (the only HV Ammo I buy/used consistently)
As for the 200 yard aspirations-I'd strongly suggest sticking to 50 yards for now, and do some reading on bullet drop using subsonic ammo. Lots of guys shoot that distance and beyond...but rimfires are very different than even the lightest centerfires, and long-distance 22LR shooting brings with it some different considerations/challenges