Mamluks achievement run, first idea group

I'm currently doing a Mamluks run to chalk off Breadbasket of the world and The Levant turnabout. 1464, about to start my second war against Ottomans with Venice and Hungary as allies. Integrated a big ved Fadl, still have Syria which I'll feed some more, Hejaz with provinces stretching to the crossing into Adal (integrating currently), and Yemen as vassals. Working on grabbing diplovassalizing Mahra next.

As I just embraced renaissance (thanks Venice for the share), I unlocked my first idea group. But I'm not sure which way to go. Purely from an achievement point of view I might be better off with exploration or expansion to get colonizing so I can get allies in North and South America and Oceania. Would that be my best option? Or should I just pick it these later on?