Drilled & predrilled?
Predrilled to me means coming from the manufacturer with bottom drilled and walls for megaflow kits installed.
Drilled to me means drilling it DIY style. So somehow you still need to flow water to sump system.
My personal preference, and the next large tank I own will be predrilled with overflow kits installed plus upon arival the tank will go to glass shop and be drill for closed loop's also. Absolutely nothing in the tank mechanical to remove, fix, clean, maintain, etc.
As long as were on the what to do topic - put in a sump and a seperate 10g
refugium also!
Have my own 210 and now designed and set up 150, 120, 72, 65, 60, 3 - 55's, 45, a double 55 system and a 6 x 20g system. Currently working on yet another 55 with sump and seperate refugium.
Three things to never skimp on - lighting, skimmer, and FLOW!