I'm terms of experience offered I think they are distinct enough, but they are both time sinks once they get their hooks into you, so from that perspective I agree. I think a lot of people will be happy with both though, and if they are smart they could well exploit the runaway success of Apex by doing some link ups between the two games.
Apex success I think it's what they hoped for, but it's probably a lot bigger than they realistically expected.