Like Elsa and others have said, There is no comparison, because there is no one size fits all.
I find life as a single parent a lot easier than being in the shitty marriage I was in, the burdens weren't shared, I wasn't paid attention to, I had all the stress of the kids with no breaks as well as having my ex and his wants and needs to contend with.
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If someone in my life is stressed or upset then I will do what I can to sympathise with them, not chastise them because they are having a hard time of it.*
I'm financially better off now that I don't have xh breathing down my neck watching every penny I spend and criticising my priorities while he buys himself toys and gadgets.
He pays CSA minimum, I also work and get tax credits, meaning I have a nice life with my DCs. My new DP doesn't live with me, but treats me to weekends away, buys me nice gifts etc.
He has the DCs for one night a week, whereas before they were lucky if he spent half an hour a week with them. I get a full night to myself, which is bliss!
New DP is al also very loving and supportive unlike xh. Xh used to work shifts, so rarely around at weekends and also worked away from home for a while, either coming home every few days or at one point, every 3 weeks for a couple of days.
I realised then that I could live without him because it WAS like being a single parent. I had no support, no affection, no company and full responsibility for running a home and family. I was still working and also solely looking after 3 DCs and even when xh came home he was tired and useless and "didn't know where things were kept, or what we had in the cupboards or what people liked to eat" so was no help at all.
Life really is easier and better for me as a LP than it was when married to him, so I think yabu to resent others saying that - everyone's situation is unique and if someone feels unsupported or left in the lurch by their DH then I think they probably would manage fine without him!