I have 3 good beers I want to have. One is a DIPA. The other is a porter. And the third is an imperial stout. In what order would you drink these?
I like to drink a dark beer either the porter or stout before drinking something hoppy as I think it really makes you taste the hops a lot better. The only thing I wouldn't recommend is drinking the stout and immediately following it up with the porter because I think the taste of the porter will be overwhelmed by the stout
When a bar does beer flights they usually do lightest to darkest. or by the ABV. But make sure you have some water in between to clean out your mouth.
I would go with the DIPA first, take a break, eat some bread/cheese, then Porter , followed by Imp. Stout. ABV matters for sure, but those roasty brews hang on the palate. No real rules, you might even play around with the order using smaller glasses and see what seems best to you.