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Unfair comparison. MIUI is also a Custom ROM it's stabke because of it's international market funding and teams dedicated while other ROMs have only got handful of developers who do their best.
Also, Unlike MIUI, They don't sell cheap ads for cheap money.
I've used so many custom roms but ultimately the rom which I use most of the time is miui. It have so many features built in, so I don't need anything else. The variation of themes make it more cool, I never get bored of its look..