Answer:
Initial price and operating cost
For example FLAGELLA CAN NOT MOVE AS A COORDINATED TEAM, ONLY CILIA CAN MOVE AS A COORDINATED TEAM THUS, THE BEATING PATTERN OF BOTH ORGANELLES ARE DIFFERENT.
Also, cilia are short and they are usually numerous in number while flagella are long and are usually few in number.
the bigger the size the more easier to see from a distance and the smaller the harder to see
It can support the carrying capacity