I only have the GLMs so I can only speak for them. They are my favorite line. They have great sculpts and paint apps. As for sizes I think it will be very difficult to mix. I was considering getting the Figuarts Brook instead of the GLM Brook. But, when I found out figuarts Brook is only 15cm against a towering GLM Sanji and Raleigh at 17cm by Banpresto, that idea went down the drain.
Here's some helpful info off Wantana Blog on the new Figuarts Zero sizes:
Jinbei ■ (about 18cm) Moria ■ (about 22cm)
Bear Basoromyu・■ (about 22cm)
Sentoumaru ■ (about 18cm)
Buggy ■ (about 14cm) Captain ■ (about 16cm) ( not sure who is meant by captain on google translate) Marco ■ (about 15cm)
Jo's ■ (about 20cm) Luffy ■ (New World ver.) About 13cm
Nami ■ (New World ver.) About 13cm
Robin ■ (New World ver.) Approximately 14cm
Usopp ■ (New World ver.) About 13cm
**Frankie ■ (New World ver.) Approximately 16cmSanji ■ (New World ver.) Approximately 14cm**
Brook ■ (New World ver.) Approximately 15cm
Chopper ■ (New World ver.) Approx 6cmZoro ■ (New World ver.) Approximately 14cmThanks for the hard work Alina.
I think Captain is Kid.