You can check this out on cleartax portal for both the regimes, it will give you a better idea. I guess there might be other tools also to help you identify where you can save more.

Intern

My research tells me old as my salary isn't a lot more than the 7 lakh tax slab, but my friend says new is better? Help

So if I'm willing to invest most of my salary in tax saving instruments, which tax regime to opt?