For more dakka or speed you'd probably need an alternate unit selection, yes.
Note, a 4x4 table is pretty big when it's just 200 points worth of units, and every loss counts. It makes the ability to get around very important as it will let you pick your battles and get the first shots off. For that reason, Fast Attack is usually my first stop for Kill Teams... For Orks, I could see Deffkoptas doing well, and interestingly the oft-neglected Warbuggies might just be MEAN with no Heavy Support around.
Ask not the Eldar a question, for they will give you three answers; all of which are true and horrifying to know.