Hoping that there is still a flow-up three years from now is a pretty poor reason to come to Compass. Keep in mind that this would also mean there's a flow-down in place, and unlike Mesaba, NWA pilots can currently take every single seat at Compass and completely flush the list. Delta pilots have a no-furlough clause in their new LOA so guess where any furloughs in this merger are going to come from? I'm around the top 35% of the Compass list and I'm basing my financial planning on getting furloughed a year or so from now.
Now, if you think that there aren't going to be any furloughs at NWA, then Compass is a better deal. Although the contract isn't super great, we're treated fairly well (so far) and most of our "refugees" from airlines such as yours find it a vast improvement. If that's enough to make you take the plunge, go for it....I wouldn't do it based on a flowthrough agreement that may not be in place in a few years and will just as likely have resulted in your furlough.