@knutliott you have to learn how to use PELE, it is actually broken and too powerful, as long as you learn where to aim.
Not only it does more damage then AP, but is super useful on the well armored tanks,at least most of them. Lets say that a T10 MBT is facing you, exposing only the front, there is very little you can do to it with AP, use pele and aim at the right point, that usually is the upper edge of the turret, it works very well with the Abrams and many other MBTs, but ie for the merkava is the lower part of the turret, and your PELE will magically do a lot of damage.
Some tanks like the PL01 and the Anders are more resilient to PELE, frontally you have to aim at the right spot and if they expose only the side are completely impervious to it, and this is why you should also carry some AP rounds that can pierce their sides without problem, but PELE is the way to go in 90% of the cases, is what let you damage most heavy armored tanks from every angle. AC is the main weapon of that tank, the top attack missiles are very situational and should be used only on certain tanks, ie against T15 the first one is blocked by the APS, but then you usually hit for full damage as long as the T15 is spotted by some other player, so remains your target, while you are behind some hard cover, while against the Terminator usually you get only at best reduced damage.
AC is the main weapon and PELE is the reason why, it is almost broken as I told as let you do damage to tanks that an AC should not touch, like an MBT that exposes only the front, maybe when it is hulldown so the heavy guns of your team can not touch him, so easily and effortlessly as long as you learn where to aim. I suggest you some trips to Alabino and a little experimentation, you way to see how the PELE of the AS21 is useful and powerful will be completely changed, it is not against the Bradley that it shines, as every AC can do damage to a Bradley (but the one of the crapjeep that can only penetrate its back), is against the well armored tanks.