The main difference between the two choices (other than price/looks) is that Wilbers are built exactly to your own requirements like a 'made to measure' suit. Ohlins are not:
Tell Wilbers your riding style, weight, ride height, use of pillion/luggage etc and they will assemble the shocks with the correct spring weight, suspension travel and damping you require.
Buy the more expensive Ohlins and you may still have to spend out on new springs, alterations to the damping etc, rather like buying an 'off the peg' suit and having it re-tailored.
For this reson I bought Wilbers over Ohlins, and haven't regretted it for one moment.
For an expert opinion, phone Revs Racing and ask to speak to John Gaskell, he can advise you of all the pros and cons and the price/performance options available.
www.revsracing.co.uk/