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I have about 95+ favorites spanning all gens.
>Primeape, Machamp, Jolteon, Poliwrath, Megazard X, male Nidoran
>Murkrow, Magcargo, Teddiursa, Girafarig, Granbull, Smoochum
>Swampert, Treecko, Torchic, Surskit, Jirachi, Spinda
>Chimchar, Piplup, Pachirisu, Buizel, Lopunny, Riolu
>Emolga, Whimsicott, Golurk, Dewott, Tepig, Zorua
>Diancie, Braixen, Skiddo, Trevenant, Sylveon, Pumkaboo
>Litten, Primarina, Midnight Lycanroc, Toxapex, Salazzle, Ribombee
>Greedent, Cramorant, Dubwool, Alcremie, Polteageist, Boltund
The best designs imo, are the smaller ones, and those based on and more closely resembling real life animals. My favorite gens in terms of designs are 3, 5, 7 and 8.