MLAG Question?

Dear All,

I have 2 new N4032F switch as core and direcly connect to firewall, I'm still confusing to choose between Stack or MLAG. Here my topology.

My question is :
- What the difference between Stack and MLAG?
- What is the recommendation/best practice should I use for this topology? using MLAG or Stacking? Why?

- If Im using MLAG :
a. can the link between PartnerSwitch to CoreSwitch is using mode access?
b. How many partnerSwitch can connect to MLAG domain?
c. Should I'm using MLAG too for link from CoreSwitch to Firewall?

Please kindly need your help.