Should I take risk and wait for HSBC or join BNY?!

Hi folks,

I have currently two offers in hand-

BNY- 72 fixed - Vice President

And I am expecting an offer letter from
HSBC - Senior Associate Director where fixed would be around 78 to 80

Now the catch is
the joining date for BNY would be in 2 weeks
Whereas for HSBC it would be around 6 weeks.

So my question is how is the work culture in HSBC compared to BNY AND is it worth giving up 2 months compensation to join HSBC and how long does their background verification takes.