I don't know what "today's" top synths are, but, i surely know what my top synths are.
I'd categorize them anyway. Hard to give a general list, because there's always something the one or the other is best at. I'd say, for analog modelling, the best synths come from NI (Monark, Reaktor) and u-he (Diva, RePro and stuff). For wavetable synths, the best comes from Waldorf (most notably for me Largo, at least that's the one i like the most from their soft synths). And, the best hardware VA like synth, think Virus, Nord Lead, JP-8000 and stuff, for me is Spire. I don't know about granular synths, but, i'm very happy with Padshop Pro in that regard, and, i doubt i'd ever need anything else for granular.
So, all already quite old stuff. But, i demo'd quite a few synths after that, and, nothing really blew me out of the water, or could have motivated me to buy, and use it over what i already have. I still think there's too few real "character synths" coming out these days. Rather synths with a very clean, polished, and soft sound. Seems to be hip these days, rather than punchy, snappy, clicky, or aggressive and raw synths. Those seemed to be rather popular 10 or more years ago (Komplexer, V-Station, for example). Almost every synth i try out these days has that super bright, clean, polished, and soft sound.