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If you didn't like Unova you probably won't like Kalos, because they're both built very similarly and the only difference story-wise being that Gen 5's difficulty isn't as piss-easy and most of the character development in Gen 6 is given through one-off optional interactions.
Gen 7 and 8 are similar enough to each other in terms of raw gameplay design but aren't really like anything else in the series. If you only want Pokemon for the nostalgia itch then try Let's GO since it's a fresh take on Genwun that doesn't completely butcher the gameplay formula like the rest of Gen 7 did.