Have to agree with the 44 route. I flew those 'wee beasties' for about 1800 hours then transitioned into the 412, which I of course love. I will however say I'm glad that I learned how to fly as a single pilot and make decisions on my own. I'm thankful of that. I'm also thankful to have experienced being scared too!! I'm certain we have all felt that pull in the stomach.
Now as far as the 412 goes, I personally only have 400 hours on the aircraft but I'm only just learning what I was taught in the training. It's now making sense. I am re-reading my training manuals and I now understand things far better than when I started. I also fly it 6 days a week so I get time to learn.
150 hours is great twin time and will certainly set him up in the future but I agree with What Limits says about the PIC time.
IMHO opinion take the 44 and the PIC time and build those hours!