Cauliflower breaks down quickly, so while you want bite sized pieces, be careful not to cut them too small.
The type of lettuce you use is ultimately up to you. We prefer a fresh spring mix for variety.
For a lighter alternative to mayo, try Greek yogurt or low-fat mayonnaise. You can swap the sour cream with the low-fat variety if needed. Not a fan of pickles? Feel free to omit them. Fresh lemon juice is always best.