Honestly, I think it’d feel completely different physically and emotionally. Walking on four legs, flying if you're a pegasus, or using magic as a unicorn would totally change how you experience the world. Ponies also seem more in tune with their emotions and community, like friendship is truly a core part of life there.
And getting a cutie mark? Imagine knowing your purpose so clearly it’d be life-changing. Whether mare or stallion, I think being a pony would feel more connected, more magical, and way more freeing than being human.