One can say only so much on headsets, but it does amaze me how many very similar headsets there are in the pilot shops.
I did once try a large number of them against an aircraft noise source and found most of the £200-£300 ones very similar in performance, differing in comfort but most fairly awful, the Bose X (£800 then) and the David Clark 13-30 (about £500) way ahead but with the DC having much higher pressure than the Bose.
For a renter (i.e. no aircraft power option) there is no solution to the ANR power issue other than a headset which uses off the shelf (AA or AAA or PP3) batteries, and carry a spare. So an ANR headset with a built-in non-removable rechargeable battery is IMHO useless unless one charges it before each flight.