I have the samsung chip running in a 6s and have ran the Geekbench 3 processor test a couple of times. Results are :-
test 1 - single core - 2549, multi core - 4445
test 2 - single core - 2552, multi core - 4460
I tend to run my phone without really making any batter saving selections (i.e. i run with Bluetooth, WiFi and Mobile data on all the time, don't use low power mode, keep the screen on auto brightness and don't reduce any animations etc.) and tend to finish the day with around 40% battery after around 6-7 hours usage (Facebook, phone, email, safari, youtube, the odd game etc.) and around 16 hours standby.
Today, i've used the phone around 40 mins (mainly Facebook) and have around 2 hours standby and am still on 100%. Overall I am very happy with the performance of the device and the battery life. All devices have tolerances in their performance and you will most likely find that there will be good and bad versions of each chip. If it's true that there are more Samsung chips out there, then perhaps there are more folk with chips that are performing less well. I would be however that there's not much in it between the best and the worst of TSMC chip and Samsung chip. It could even be that the tolerances used by Samsung are wider than those used by TSMC, so there are more extremes.