At the end of the day you need both, from an insurance point of view its a case of how many hours you have on type, a situation. A pilot I know had 1200 hours total 300 hours on 172 and singles close to 700 on Grand vans, twin time zero. He got a rating on a senneca 2 and had to pay a higher excess and premium than I did with only 600 hours, as he had no twin time as well as have a safety pilot for the first 50 hours with a large list of no gravel strips etc.
Bottom line you need both either way you loose, Thats aviation