ER vs no Er but more tanky Aravi

1.                                             2.

2000 atk                                    1800 atk                

26000 hp                                    22000 hp

150 spd                                      136 speed

100 crt                                        100 crt

254 cdmg                                   247 cdmg

11 er                                            105 er

Both on counter set with +30 crimson seed

I reason for the er build is from the idea that it might make her solo potential become better cause u wont be able to easily CC her

What u guys think would be the best build between then two for RTA?

Thanks