I have some synths but beside NI Massive I don’t really use too much synths, mostly I use samplers, Kontakt and Engine getting most of my attention.
Nexus is my fav, but if we are being specific, I wouldn’t say its a synth, more like a ROM player.
Tone2 Gladiator is a top notch synth, small footprint, big sound.
My favorite vst instrument is EZkeys
Lennardigital Sylent + Sylent Dark Blue
Spectrasonics Omnisphere. Undoubtedly one of the most versatile and best sounding softsynths created to date.