I'm planing on doing the ME CPL route mainly since its more ME time which can only benefit me. Whether you do the CPL in a SEP or MEP, both come with their own set of difficulties.
For me in a comparision point of view, so much more can go wrong doing a PFL with a hefty ROD. The drawback is it will cost you more to retrain in the twin than it will in the arrow but its not much more per hour (£90ph more with the provider im looking at..in the grand scale of things its not as dramatic as you make it out to be).
Yes the aircraft flies faster but your legs will be slightly longer so timings shouldn't be a problem. You do have a visual problem with two big donkeys either side of you. Providing you've flown an aircraft more than 110kts then you shouldn't need to worry about the speed aspect imo.