There is no "best" synth out there. Although there are some VERY good ones that professionals prefer, such as Native Instruments Massive, Spectrasonics Trillian or Sylenth1 by Lennar Digital.
Also production depends on how fast/willing you are prepared to learn. Some bits of production are far easier to learn than others, I love building solid drums but really dislike sound design. If you really want to start production seriously, then perhaps do invest a little in some courses by Sonic Academy/Dubspot. However, I've found alot of these schools concentrate on the basics rather than more of the advanced stuff (which makes sense for beginners), but don't expect to be making the sounds of your favourite artists within a month. It's a long process that's always evolving and requires attention.
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