Will losing re-gained weight be easy 3 years post Gastric Sleeve surgery?

I am having difficulty losing weight now, I haven't done the surgery yet and I have a BMI of 45. I was wondering in case of an unfortunate weight gain after sleeve surgery will it be difficult to lose weight a few years into surgery similar to the difficulty experienced before surgery or will the reduced stomach size, absence of ghrelin etc. make it easier to lose weight once we return back to healthy lifestyle. Is gastric sleeve or gastric bypass better for losing weight gained post surgery?

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