I'm leaving Qatar soon. I have one flight with QR planned to SE Asia and the flight out will be with them. I'm currently Gold member. In the future I'll be flying to Abu Dhabi regularly but will be based in the UK. Business travel will most likely be with Etihad, vacations with whoever has the best flight times and prices. No substantial airmiles left in QR. Should I book the flight out and SE Asia trip in a yet to be created account with British Airways or are there better options? Is there anything useful I can do with Etihad miles?

I use the miles for award tickets and don't think I'll get enough for a decent status.