It is always gonna depend on what you are trying to do...a small smart tv is gonna be really versatile for sitting in an office, and would have multiple inputs...if you need a higher resolution and or refresh rate, check out computer monitors specifically ... don't overspend if you dont want specifics, BestBuy has some great deals on small tvs, and open box deals in store are typically good as new.
I bought a Dell 24" and it works perfectly as a second monitor.
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