When you are comparing hours of R22's and Enstroms, surely it doesnt matter what the total hours flown by the machines are as most accidents happen within the 1st 200 hours of the pilot hours.
R22's have very few mechanical failures - almost all are down to pilot error and occur within the pilots 1st 200 hours.
There has been no fatality in any UK Enstrom pilots 1st 200 hours (or any more hours for that matter) therefore they are safer QED