The white population of Rhodesia, at the pre-Chimurenga peak, was around 250,000. As Goughy pointed out, by 1992 that was down to c. 100,000. It's now probably less than 15,000. Zimbabwe were able to compete in the 80s and early 90s because of the schools and the fact that sport was and is a huge part of white life there. These days, however, cricket is actually the second-most popular sport in the country. Football is way out in front of course, but the fact remains cricket is the sport Zimbabwe has had most success in. How many currently active Zimbabwean footballers can you name? Benjani, Dickson Choto and that's it for me. Rugby players? Victor Olonga (and that is just because he is Henry's brother) Other sports? Cara Black, Wayne Black, Kevin Ullyett, old for tennis players these days; Kirsty Coventry, who is very popular in her homeland; the sprinter Brian Dzingai who made an Olympic final; and Nick Price, who is long past it. How many other sports has Zimbabwe had equivalent success to cricket in? None. There is no reason why if the situation improves Zimbabwe cannot become better than they ever have been at cricket. So I think, "per capita" Zimbabwe are actually underachieving due to the social, economic and political factors affecting the country whereas they once overachieved thanks to their social structure (i.e. the schools, the culture of sport). what needs to happen is melding the popularity of the game- which produces all the black players really- with the school system and the sports culture that produced the stand-out Zimbabwean cricketers, your Streaks and Flowers. I've said before that Masakadza, Chigumbura and most of the other national team players are as good as most white Zimbabweans ever were. No reason why they can't produce top-quality players again, black men this time, if and when things start to get better.
That is basically why I would vote for NZ ahead of Zim in this poll. In NZ the dominance of rugby, population size and climactic conditions militate against cricket being successful; and yet it is and has been for more than thirty years now. The pre-mid 70s NZ record is the record you'd expect of a country where cricket faces those problems; the fact that we/they have eclipsed that is a real feat.