I was planning to play 4x crusaders this season as my first setup - I had intended to level all 4 at once, but wondering if it would be much faster to level 1 and then boost the other 3 (given that it's fairly easy to gear with the 'free' set, you can become strong at boosting fast).

What is everyones thoughts on this?

Leveling 4 at the same time would carry the advantage of loot share while leveling, and a better chance of getting puzzle rings - But it would probably take a bit longer than speed leveling 1 and then boosting.