Need Help/advice For Gear Set Ratio..

Hi guys, im sorry if this topic has been discuss before..

Anw, i've been wanting to change my gear 4th set to 20t but i can't decide which give smoother acc for topspeed/distance. currently im using 21t..



My setup,

Uma superhead

Uma 62mm block

Keihin PWK 28mm

Leo Vince sbk exhaust

Yamaha Thai non-cut off cdi

15-33 sprocket



Any suggestion?

Im rinding Spark 135 (4 speed).



T.i.a



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