Hi, I'm currently booked on a trip to Paris as follows:

Outbound is DTW - AMS on A330 in Business
AMS - CDG on KLM in Premium

I purchased B class and upgraded with miles.

Return is CDG - AMS on KLM in coach
AMS - DTW on A330 in coach.

I wanted to go through AMS so I could try out the new A330. This will also be my first time in NW WBC.

My question is do you think I should pay the extra money for round trip B class and upgrade to WBC on the return. I was checking I availability for this and there is none going through AMS, but if I went CDG - DTW it is showing I4. My ticket currently costs 683.48. I think to change to B class on the return the ticket price would be around 850.00.

My reservation hasn't ticketed yet, so I can still make changes.

Any thoughts on what I should do? How is the DC-10 WBC compared to coach A330?

Thanks.

My travel dates are 02/18 - 02/24