Preworkout shake casein?

[bigronny]

as a preworkout meal one and half hours ago before workout I usually have cytosport muscle milk light 25 g protein and 11g carb and 1/2 cup oats , I during cutting phase but some one told me that casein is not a good preworkout drink , what do you guys think

 

[ksa]

eat a regular meal or whey & oats 30 min pre-w/o.