Originally Posted by Diabo

You're about to choose a SkyTeam ffp. Would you rather use Delta Skymiles to get into their lounges (and pay a fuel surcharge for KLM award flights) or would you choose FlyingBlue and not pay the surcharge for the same award flight?

When you're disloyal enough not to worry about maintaining status with an airline, other factors become important. Things like mile expiration policy and cost of award tickets.