Hello, Shekhar Mishra,
that is the interesting one.
Well, in my opinion, the ECA maybe is quickiest way to earn some money,
but the team building, is better for the long run.
Becouse, the bigger your team is, your options for earning as a TL is bigger.
aAnd as a TL you have much more options for making money. So if you want quick money,
you should do both in the same time. I hope that I helped a little.
Good luck!
