No brainer
I’ve flown that flights a number of times. 14+ hrs going and 15+ on the return. Paying that difference is a no brainer. Not just for peace of mind, but also for the rat race that is the Mumbai airport. U would be one of the 1st passengers off the plane, (its a very long walk to immigration). And a much shorter business class line to clear immigration. On the return, u get GVK lounge as biz customer and a special line for security and immigration. That in its self is worth it. Didn’t even mention the Polaris experience. Lol
get it done!!