Depends on what you want to do with them.
2.28 x 2.28 = 5.20
2.28 x 4.7 = 10.72
With both 2.28's you only have two combinations of low ranges and a little lower than one 4.7.
With one 2.28 and one 4.7 you have three ratios to chose from (2.28 / 4.7 / 10.72)
Over all you will love the 2.8 / 4.7 combo.
The choice is yours.
