I'm sure it's a much debated topic, however I'm moving to 4k. Which would be my best bet, 4k TV or 4k Monitor. Not positive that I am, but just assume I'm ok gaming at 60hz.
all the monitors big enough not to have scaling issues at 4k seem to have problems (QC, burn in, input lag, etc), tvs as monitors will pretty much always have input lag and may have other issues. It's up to you to figure out which issues actually matter to you, unless you're a pro gamer input lag may not be as relevant for example but even some non-pros do find it annoying. For tvs your best bet is probably to hit up one or both of the major samsung threads to see what's working or not for people.