I think Server Side and Client Side, both have advantages and disadvantages.

Server Side:
Adv:

• More efficiency
• Easy to scale up(if the process is too complex, we can use load balancing)

Dis:

• Hard to deploy, to some complex operations, it may be required CLI store procs.
• More expertises required

Client Side:

Adv:

• Easy to be implement, You need to know C#
• Easy to deploy
• Easy to be manage

Dis:

• Less efficiency

I think, in generally, for complex operations, we can try to put that into the server side. For simple operations, just putting them into the client side logic. That is simple.