Monty and Patton were certainly of different leadership styles, but certainly in the early stages of the campaign in NW Europe they also faced very different challenges. Monty was up against more experienced panzer and SS panzer troops than Patton, which inevitable coloured the end result (glorious breakout by Patton, bloody stalemate at Caen by Monty).
Personally, I think Monty was certainly flawed as a leader – cold, fussy, too concerned with details and being ‘tidy’ – and I don’t suffer any nationalistic stubbornness that would stop me from acknowledging Patton as a better leader, but I’m not sure when you could compare his achievements with Patton’s fairly.