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I don't know if it has been officially confirmed, but there has at least been a lot of highly credible speculation that WEMC will be discontinuing the extended warranty and price protection features as part of a benefit overhaul (adding phone protection on some cards, as well as Lyft and Postmates perks). I say "highly credible" because the reports were right about the perks that MC would be adding.
Given that, I'd go with Cash Magnet for good benefits and a straightforward claims process.
If you had a major Citi card (like the Costco Visa, DC MC, AA Platinum MC, etc...but not the Citi Retail cards like Best Buy Visa), there might be room for debate between Amex and Citi.