Some people are quite particular about which pharmaceutical company they choose for their COVID-19 vaccine.
Some people prefer certain pharmaceutical companies over others when it comes to the Corona vaccination.
ーSome people are quite particular about which pharmaceutical company they choose for their COVID-19 vaccine.
「どこの製薬会社のコロナワクチンにするかこだわる人もいる」
particular about ... で「…についてこだわる・こだわりを持つ」
pharmaceutical company で「製薬会社」
ーSome people prefer certain pharmaceutical companies over others when it comes to the Corona vaccination.
「コロナワクチンとなると、他の製薬会社よりも特定の製薬会社を好む人がいる」
to prefer ... over... で「〜よりもむしろ〜を好む」
when it comes to で「〜ということになると」
ご参考まで！
カナダ 
