Pipe for polo mallet heads?

Was wondering - which is preferred, the blue or the yellow?

I got one yellow head a while ago, and just got some blue from Dante - looks thicker and smaller diameter.
Does it last better?
Does it mean less need to cap the end?
Heavier?
any advice appreciated. I will build with it this week anyways
The blue and yellow are the same grade of HPDE, the external sizes are usually identical but occasionally you can find 50mm external diameter blue pipe.

You can use the 60extD pipe uncapped quite easily (we have until recently).

I've been using a 50mm uncapped mallet which is tiny 855mm long which I love but others would hate. Similarly I can't seem to play with anything longer than 950mm anymore

The best recommendation I can give is build lots of different mallets and try them all out until you find something you're comfortable with (or borrow lots of other peoples mallets when ever you play)