Just thinking aloud whether OSL or MXP would be a better experience in C.

1. MXP-BKK is almost guaranteed 772ER as far as I know (since non-ER 772 can't fly that far), and OSL-BKK seems to be reliably an A345 or A346, so I don't think either route has any serious risk of equipment swap.

2. At the dates that I'm looking to fly, MXP-BKK looks more than 66% full, whereas there seems to be almost no-one on OSL-BKK.

3. Flight timings are very similar so there is no real difference in that area.

4. The 772ER seat is supposed to be better than A345 seat, but in what way? How much difference in comfort is there?

5. I would love to fly the A345 as I haven't yet done so before, whereas I've flown the 777 dozens of times already on a number of airlines. But I'm willing to go with whichever gives a better experience.

So, what would you do in my situation?

Cheers.