It's good to see a helicopter PPL question in this forum, but your comments about
Rotorheads are silly. I'm only a PPLH but I've always found the "1000's of hours chaps (and Girls)" very helpful. People who ask FAQ are directed to relevant threads and sometimes have their own thread locked, but not often enough IMHO.
There's an index to common helicopter training questions here:
FAQ
Unsurprisingly, you're not the first person to ask for advice on the best helicopter for training. The FAQ Index would have taken you there but, to save you the trouble of looking, here's a direct link:
Best helicopter for training
I trained on the R22 and have no complaints.
The 300 is said to be more stable, therefore easier to fly, therefore an easier helicopter for training. (I don't know because I've never flown one.) They cost more, but that may not be a factor.
Enstroms have never been as popular as the other two; I don't know why.
If availability and cost weren't issues, then I wouldn't train on any of the above. I'd choose a Bell 47, no contest. It's a wonderful helicopter, a joy to fly and probably the finest trainer ever.
Dennis displays a 300 now, but has also displayed Enstroms in the past - and was an Enstrom agent. If I thought flying the same type as Dennis would enable me to fly like him, that's the type I'd be flying. Unfortunately, there's a little more to it.
IMHO the initial training aircraft doesn't make any difference when progressing to a more complex type.
eg I did my first turbine rating on a Jetranger not long after getting my PPLH on the R22. I needed to learn about operating a jet engine, and learn the Jetranger's more complex systems, but a Jetranger is easier to fly than the R22. I later added a Gazelle rating, which meant learning new systems again. As you probably know, each new helicopter type means further training and a test to obtain a rating for that type on your licence. (eg An R22 rating doesn't entitle you to fly an R44.)
I was particularly surprised to read you were worried the experienced pros in Rotorheads might laugh at you because, by coincidence, a thread last week made me think how amazingly helpful they are. A student pilot said he was having difficulty with one aspect of his PPL training and asked for advice. Within hours, experienced pilots from all over the world were trying to help him, including two of the world's top helicopter Test Pilots - Nick Lappos (ex Sikorsky) the most famous and respected TP in the rotary world and Rich Lee, TP in charge of the Apache programme.