Of course I'd prefer to go CW both ways, but I suspect the saving you'd make by going WT+ on the outbound would be well into four figures and could be better spent when you're on holiday. The WT+ seats are as wide as the CW seats. Just make sure you get a bulkhead seat (you probably will anyway with the baby if you need a bassinet seat).

CW on the way back as it's a night flight and you will get to lie flat.