That's why "xxx is best" without defining a purpose can not be true.
40 series rubber has a taller sidewall than 35 series rubber if the width of the tire stays the same and in theory the taller sidewall will feel better. There is a vast difference in ride quality between tires even when the sizes stay the same. Continental ECS ride sooooo much nicer than Bridgestone RE71s. Largely due to the softer sidewall. Also, a slightly pinched tire (on a wheel that is narrower than normal) will feel better than a stretched tire.
Doesn't matter though, you already have 17s on the rear and want to stay with 17s. Take your existing rear wheel and put it on the front and see if it fits.
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Donny
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