Aside from shitty Black Kyurem not being as overpowered as White Kyurem, I think Black 2 has the better selection of exclusive mons overall. Strong mons like Latios and Garchomp. And also waifumons like Lopunny and Gothitelle.

>Black 2 exclusive mons
Weedle / Kakuna / Beedrill
Magby / Magmar / Magmortar
Spinarak / Ariados
Bonsly / Sudowoodo
Heracross
Plusle
Volbeat
Spoink / Grumpig
Latios
Buneary / Lopunny
Gible / Gabite / Garchomp
Gothita / Gothorita / Gothitelle
Vullaby / Mandibuzz
Zekrom
Black Kyurem

>White 2 exclusive mons
Caterpie / Metapod / Butterfree
Mime Jr. / Mr. Mime
Elekid / Electabuzz / Electivire
Pinsir
Ledyba / Ledian
Skitty / Delcatty
Minun
Illumise
Numel / Camerupt
Latias
Solosis / Duosion / Reuniclus
Rufflet / Braviary
Reshiram
White Kyurem

>source
https://www.serebii.net/black2white2/exclusives.shtml