I'd personally prefer the game to fluctuate between 42 - 60 FPS rather than lock in at 30 FPS.
This reminds me of The Last of Us: Remastered for the PS4. The game ran "most of the time" at 60 FPS but would occasionally drop, but alternatively if you wanted to, you could set the game in the options to lock in at 30 FPS (original FPS on the PS3).
Personally I preferred the default option, because for the most part the game felt a lot smoother to me and ran quite nicely.
This reminds me of The Last of Us: Remastered for the PS4. The game ran "most of the time" at 60 FPS but would occasionally drop, but alternatively if you wanted to, you could set the game in the options to lock in at 30 FPS (original FPS on the PS3).
Personally I preferred the default option, because for the most part the game felt a lot smoother to me and ran quite nicely.