Switched out my 718 AP1 4 iron for the U510 a year ago and never looked back.

Well, a lot depends on your swing and the conditions you play in to determine what works best for you. Generally speaking, U505 will be highest launching, T200 will be lowest launching with lowest spin, and the AP1 will probably be somewhere in the middle. Shaft is the engine of the club though, so shaft selection can alter the launch characteristics significantly. Personally, I hit both the U505 and the T200 before going with the T200 mainly because of my preferred look of a traditional iron at address. The stock HZRDUS shaft didn't work for me though, so went with my trusty AD-DI instead. I definitely wouldn't consider the T200 as "forgiving" though, so if that's something you need, I would look more at the U505 or the previous generation U500 or U510.

@Brock L Yes, the shaft is the engine of the club and the stock HZRDUS shaft didn't work for me it feels dead.
My irons are T200 (2020) 5-PW, tested a U510 4 iron for a week with a HZRDUS shaft and will try U505 with a different shaft.

I have the U505 22 degree as my four iron and couldn't be more pleased. Paired it with Fuji Atmos Tour Spec Blue shaft and it is a very impressive stick. Really nice high flight and great off the tee on long par 3s and short par 4s. Wish I had more opportunities to use it at my home club.

Prior to getting my T200s, I had 718 AP1s and 4 irons in each set. I didn’t have a problem hitting either. For me, the AP1 was lower launching, really because of the shaft (Project X rifle, 6.5) and the T200 has a Project X LZ 6.0. I’m getting similar distance, but I’ve only had the T200 about a month. I actually feel though that the T200 is easier to hit, it just gets through the turf easier in my opinion.

hello ,Im trying to get new set of iron ,my handicap is 13 ,I play 2 X week ,my ball flight is high ,I hit my 7 iron 140-145 yards , Im using Ap718 ,any recommendation ?..pls

Swapped out my C16 4 iron and 818 21 ( conditions determined which one I used) for the 510 4 when it came up. Never used the others again. I tried the 505 when it came out, no difference so I stayed with the 510. Favorite club in my bag for long par 3s