Does the barrel/handle size really matter? Also, do I really need thermal? I did read that boar bristles were better than plastic. I had seen this one recommended online that I was considering for every day use (https://www.amazon.com/dp/B0725YBN8D?linkCode=ogi&tag=cosmopolitan_auto-append-20&ascsubtag=%5Bartid%7C10049.g.33368131%5Bsrc%7C%5Bch%7C%5Blt%7C%5Bpid%7C706080ed-e7ac-45d1-90b4-06be9ead51c7)