As noted by @
tcs above, the gearing is not going to make any difference to your speed unless you're going down a steep downhill with the wind behind you. The 104" gear on the DS4 is a plenty high gear for any conditions. The only things that will increase your speed will be fitness, having supple and light treadless tires, and drop handlebars. If you have heavy lugged tires on either bike that will definitely slow you down.