I have the 19" front wheel and love it. CSC sent the 18" with the bike, but I never installed it so I can't compare. The 19 feels very planted on road and dirt, so I have no reason to switch to the 18.
A larger wheel handles rocks and bumps better in general, but spudrider has done more technical trails than me (and most) with his 18" wheel. You might consider sticking with the 18 for now and rebuilding it with a 19" alloy rim later.
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