17" or 18" with stock s sedan suspension?

[manborn]

hi, i've had experience with 16" rims + 1" lowered suspension using 40 tires and i was disappointed with the hard ride. so now im stuck between ordering since 1st i thought 45r17s would be a softer ride but then im on stock suspension so it might not be that bad with 35r18s

215/35R18

or

205/45R17

i was wondering if the ride difference between the 2 above setups are huge enough to be a concern.

i will be installing them(which ever i decide on) with stock suspension.

im ready to buy, just not sure. pics would be great (i was also wondering how the height between the tires and car looks as far as those 2 setups are concerned). thanks!