Arrowhead - not quite true; if you do your CPL skill test on a multi, it will be combined with the MEP(L) skill test and you will not have to do glide approaches or practiced forced landings, but you will be tested on single-engine work, EFATO, etc. The CPL is enough of a workout as it is!
Ultimately, it all depends on each applicant's circumstances: if the money is not too scarce and you are planning to go for the IR right after the CPL, then it makes sense to "combine" MEP(L) and CPL (but, again, beware of the workload). You will also get extra twin hours. Some FTOs (BAE Systems, Leeds Flying School) do it that way (in BAE Systems' case it's also because they don't have SE complex a/c).
If, on the other hand, you want to spread the cost of your training over a longer period (or possibly work initially as a Flight instructor), then doing CPL on an SE a/c would make more sense.
Cheers