IRIX and Software

Question about feature stream vs maintenance stream

During a fresh install of Irix 6.5.30 i was asked if i wanted the feature or maintenance stream. I thought that SGI had merged these on irix 6.5.30....

I know the difference between the M and F streams and how it pertained to SGIs customers, how it effected people with service contracts etc.... My question is how does it apply today to these machines that are EOL
in other words, i have no idea if i should choose M or F and which is better for me :)
They have been merged around 6.5.22, so the difference now is purely cosmetic, you can choose whichever you like better :)