I have both of them...I prefer wearing the Corum...as the previous poster said...you won't make a mistake getting one of the two...
the Corum is a big watch...wears like a 44mm PAM, it's made of ti so it's not that heavy...I personally prefer the Corum over the IWC, but it's a personal choice...the rubber strap is comfortable and of good quality...the engravings on the caseback are clean and nice...
with the mods you have mentioned...AR and ETA DW...this one (CACC) is really a super rep....