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Toshiba HD Amazon TVs (2018) vs Vizio V-Series (2020)
No sources that perform objective hands-on testing have deemed the Toshiba Amazon Fire Edition 49" 49LF421U19 worthy of being included in their TV roundups, which typically isn't a good sign.
Moving on to the Vizio V-Series 55" (2020): no sources that perform reliable and objective hands-on testing have included it in their TV roundups, which usually means that a product doesn't make for a good purchase.
As a last step, we wanted to do a head-to-head Toshiba Amazon Fire Edition 49" 49LF421U19 vs. Vizio V-Series 55" (2020) comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.