do it in the R22, cheapest and you get the same licence and there are more of them around so more choice in training places but also most likely more R22 at the place you go to, so you won't have to wait ages for a booking during training and later for self fly hire.

Doing it in the R22 will result spending less money compared doing it in a R44 or G2 so you have money left to do an extra typerating.
Also doing it in a R22 or G2 will result in appreciating max power limits, if you train in the R44 you'll never hit the limit which could suprise you on your first flight out with your mates (of course a good school will train for this).
The transition from a R22 to a R44 is very easy.

Really impressed you’ve met every R44 pilot and found them wanting at W&B, though strangely I can’t remember meeting you, or you might have realised there was at least one exception. Other exceptions might also be available.

Now all of THAT, I can agree with. In fact I most frequently fly two up with passenger weight no more than 400lb, and even with full fuel, neither W&B nor power is going to be a problem over the East Anglian prairies that form the large part of my home turf. But I will be trying mountain flying next year and all those graphs are going to be pored over in extremely close detail.

Luther, I think you will find it is possible to run out of power on your own in an R 44, just takes bad flying .