I am selling my last gen 10" APC so take my opinion with a grain of salt.
For bare A**ed sports shooting with no LAD and other gadget APC is my pick. And I don't like these complicated non-reciprocated charging handle. AK SG55X SCAR work great, you kick the thing loose if it is stuck....simple stuff works, but americans like complicated stuff just because THIS IS the way they HAVE TO do things.
The new Gen APC 10 is lighter because they cut down the gas block size - that's the only thing I like about it. I don't like these bigger holes in the handguard so bigger debris can get stuck in. APC handguard doesn't work with PEQ14. It uses AR trigger - so for pure "sports shooting" it is my choice. AR trigger is the way to go.
Bren is lighter, and the trigger is ridiculous light for this sort of rifle, but it is definitely more of a Honda with a lot of plastic going on, it is a GLock of rifle. I honestly do not like the handguard they are using bolted together with million pieces, with eyelets at the wrong spot. It is only useable with the M-Lok factory handguard but extra $$$, but it works with PEQ14. The lower price tag comes with the fact that it is the only rifle of this type that I know of which doesn't run on steel guides. So the cam pin will slowly eat away the receiver like AR15 receiver, but the point is by the time it is not useable it will be way over 20K+ rounds by my guess or the operator is not operating anymore. At least the rail is more continuous on top, without all these outsized slots to accommodate bolts like on the APC, so more useable rail estate. If there is a need to load up on LAD, light, switches, etc etc, Bren is way more practical than the APC.
So what is the punch like? HK416 is the best lol.