Personally, the sapphire is worth it. It's a rare enough material in terms of the number of watch makers willing to work with it and this is a very limited edition. I wouldn't dream of comparing it to titanium, even if a smaller case size is more in the realm of what most would consider wearable. Look at sapphire RMs, you wouldn't dream of comparing them to titanium models and that's probably the closest brand in terms of status, pricing, etc.
Best of luck with the decision, it's truly a gorgeous watch