Well, big banks such as BAC and JPM are quite constrained when it comes to growth, I think. EWBC has a chance at growing faster than these behemoths. But the main reason I kept EWBC while lightening up on BAC and JPM is that it is not as overvalued as these two in my estimation. Defining IV as the price where I can expect a 10% annual return going forward, I have BAC valued at $36, JPM at $200 and EWBC at $105. Of course it is entirely possible that my estimate of IV is off by quite a bit.
Also, take a look at past growth in book value per share for these banks (I use growth in BV per share as a proxy for growth in IV per share).
Annual Book Value Per Share Growth
BAC
JPM
EWBC
Since 2013
5.11%
7.44%
11.48%
Since 2018
6.12%
8.95%
10.89%