For benign training try the R44. Quite a few people are doing this now.
The 300 perhaps more comfortable than a R22.
The 22 quite adequate for value training but that is really where its value stops.
Think about what you may want to fly afterwards, either if buying or hiring.
Lots of 22/44 machines about for sale (large population always turning as people upgrade) and also for hire. Far fewer 300 for hire. Some for sale.
Enstroms geographically clustered.
If buying think also of maint. costs and who provides the service from where.
Most of all, well done for chosing the H discipline.
h-r