Laser, my skin responds very well too. Pre HrT I had no redness or discomfort. I just followed their instructions, and covered up or used sunscreen when outdoors. Even now, by my last laser session, post HRT, I have very minor redness, and it's gone after about a half hour. I still baby my skin afterwards though in the sun.
Electrolysis I had no experience with pre HRT, but POST, my skin gets VERY upset with me. Loads of swelling, super tender to the touch, redness lasts for HOURS, and on the actual follicles themselves, they remain a BRIGHT red for... a week+ easily. (Still a bit red but it's fading.)