TBH Steve, IMO (FWTW) any generic training plan will be as good as the next. I did Austria 70.3 this year, and something like 98% of competitors finished... between them (3000 athletes in all) they must have used hundreds of different training plans, and for all but a handful every training plan used got the athlete through (and amongst those that did DNF, a good proprtion of those probably did so not through the weakness of their training, but mechanicals, illness etc).
By generic training plan, I mean one you get from a book, or a website and don't pay anything for ie not set by a coach (and thus personal to you) - or at least nothing more than a small one off payment to buy it. Though then again, I would question why you would pay for a generic (ie non personalised) plan when you get one for free elsewhere!
The more important thing is working at the plan. No plan however brilliant will help you achieve your goals if you average 4 hours a week and miss over half the sessions. Not that you have to be totally slavish towards it, and cannot ever miss a session... but if you don;t follow 80+% of it then you are always going to struggle.
HTH

didds