Your personalized protein powder will supply a significant amount of naturally-occuring BCAA's. Most of the time, the BCAA's that occur naturally in a scoop of protein powder will be greater than a BCAA supplement can offer. All of Gainful's personalized protein powder blends are complete in amino acids and have a lot more nutrition than simple BCAA's supplements.
However, there's nothing wrong with having both a protein powder and BCAA supplement if that is your choice. BCAA's are usually best when consumed during workouts, so you could easily have them separate from your protein shake. BCAA supplements can often be quite expensive, so ultimately we leave the decision up to you.