Don't really have any experience with return pump failures since my current system is sumpless. 0 knowledge or experience with Snapper. Best to pick the minds of those that have run pumps a few years. Having said that, the Blueline, Panworld, Iwaki series have been around for some time & should be well supported as user replaceable parts go. Pumps are generally pretty simple, motor, impeller, volute. If the motor goes south, chances are you ain't fixin' it. A bearing maybe, but that would be getting into more difficult to source parts & special tools to replace. Never hurts to have a backup pump, since once your main one is down, unless you have spare parts laying around, it could be a while until you're back up & running. My plan was to use the Panworld in the summer & the Poseidon in the winter, since the sump will be in the uninsulated basement & the extra heat added by the Poseidon would save some watts & $$s in less heater running time.
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