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Don't hold your breath on elite status on B6. They are looking at some changes to the program, but elite status is far from the top of their list of being a good idea. They've stated outright that they don't want to pick up pax based on the TrueBlue program. My interpretation of that is that they are looking to improve partner earn/burn but not much else.

DL flies bigger planes on lots of routes because they have the planes. They are also shutting down more routes than CO is and the DL cuts are from bigger stations seeing cuts IMO. And DL is in the post-bankruptcy period where they are still playing with funny money a bit in terms of their spending, though it also limits their fundability going forward. Finally, their FF program is less friendly than OnePass. The PMUs require high fare (YBM) and come from a limited bucket (I) so they are not the panacea they are often made out to be. Fuel surcharges and partner surcharges on reward redemptions aren't great either. And 2x miles don't get you last seat availability on DL metal like it does on CO.

But if you only care about upgrades it is probably better since the F cabins on their planes are larger.