Only whores cheat, thanks
First of all, ignore #1 Commenter.
Second, to answer the question, BOTH are bad.
Cheating is Cheating.
If you love your husband but wanna fuck other guys, either new or from your past, tell him first. Explain that it does not change your love for him. It deepens it.
Make your sexuality transparent, the focus of all pleasure regardless of who you're with, share all you learn with your husband, and he will adore you and want you the more promiscuous you are.
I will be happy to tell you more if you want by email.
Best wishes and good fucking. :))
Sex and love are not mutually exclusive.
My wife and I had a 3sum with another guy once. I had known him for about a year, but she had never met him. We exchanged naked pics of our wives, and my wife was completely aware of it, so when I approached the idea of a 3sum, she suggested him since he'd already seen everything. He and I respectfully kept our distance and focused on her. It was the most passionate I have ever seen her at being taken so completely. He got what he wanted, and I saw a side of my wife I had never seen. When it was over, he left and we never saw him again. My wife and I have ZERO regrets because it had no impact on our marriage.
To answer your question, its worse to cheat with someone from your past because there was a history there, and feelings that still linger.
Cheating with someone new is just a physical act for a mutual benefit because there is a need that needs to be filled.
For me I'd say someone from your past. Someone who knows you and knows you're married. Someone that you'd either been with in the past or had a spark with that was reignited. Someone you may have thought of over the years, fantasized about. It's like the rekindling of a previous relationship. Your husband is aware you had sex with other men in the past and being a reasonable person was not bothered by it because you are his now but to then let a man who you'd have sex with before you were with him do so again, it wipes out that illusion that this person no longer can be with you. But that's out.
If it's a new person, it's not like your going back to a possible better time in your past or to a person you know is a better lover than your husband, it's something new, untested, someone you have no history with.
It's a semantic thing but I feel more like I failed you if you went back to a previous lover rather than human weakness to sleep with a new person you met.
What if we don't consider either cheating? Similarly to number 3, I've shared my wife with strangers and we've enjoyed it immensely. There was also a time she asked to spend time with an old flame and I was ok with it after some misgivings. It turned out to be an exciting time for us. Everyone will have a different perception of this because we all have different views on fidelity and marriage and sexual limits.
Better if you knew someone in the past, in particular of adolescent years.