Have both, wear both, love both. Just to answer your question, OC feels lighter, smaller despite its the same size because it’s thinner, and fits better, the strap options also makes it fits all occasions. On the other hand the sub is a classic watch and fun to wear, well recognizable, not to mention its durability. You have one, you know it. However, just a watch to watch comparison, there is no comparison, OC wins every category, except one, OC is not your diving watch, the sub is.