Which Eufy robot vacuum should I choose: the E25 or the C28?

Go with the Eufy E25 if you want a reliable vacuum for $200–300 and don’t need mopping. The C28 costs $500+ for a mopping feature you can replace with a $100 cordless mop. The E25 won’t make you second-guess your purchase, while the C28’s premium is hard to justify unless mopping automation is your passion.