If nickel-silver frets give you more control for bends and vibrato, then it’s likely that you’re fretting too forcefully. All that downward pressure can make your finger want to slip one way or another. If you fret lightly, the lack of friction on stainless steel frets becomes an advantage, giving you more control and allowing more subtle bends and vibrato.
As Andy said, if you play one kind exclusively for a month, it may become your new favorite. It’s surprising how much our preferences are driven by our habits.