I run an Imac, it is 5 years old and "touch wood" has never given me any trouble. Easy updates, no virus, so far and it runs quicker than me! I am however thinking of upgrading to a newer one, if I do it will be another Mac. Mind you I do not do "Gaming" I think if you like to play games then a P.C. may be the way to go.
All the best.
Mike