There is more to this than any particular favourite for any random beekeeper. It is your job to get across the options, not to be prescriptive.
Two examples might be better - one with good attributes and one rubbish one - as new beeks may well go for the cheapest, which may not be a good idea. Boxes which get chewed (not eaten!) or where the need is for two boxes (rather than a single) so means extra cost or higher swarming risks. Using timber floors makes little odds to heat balance and (deep) National roofs, with adequate insulation inserted, may be a better option over some poly floors and roofs.
Not getting tied to one brand is important, I think. Other hive formats, than National, will have similar pros and cons.
The one universal reason for going poly - that of improved insulation, leading to lower stores usage over winter - so better potential winter survival - needs to be discussed but not over-pushed on the flock. Timber hives can be just as good if the beekeeper thinks about how they are used - not perhaps an attribute of some new beeks. There are both good and bad hives, whatever they may be made from.