These are the numbers of 3 WTC cycle. The 2023-2025 cycle is going on...
Pakistan
2019-21 : 12 M 4 won 5 lost 3 draw
2021-23 : 14 M 4 won 6 lost 4 draw
2023-25 : 7 M 2 won 5 lost
Total : 33 M 10 won 16 lost 7 draw
Srilanka
2019-21 : 12 M 2 won 6 lost 4 draw
2021-23 : 12 M 5 won 6 lost 1 draw
2023-25 : 8 M 4 won 4 lost
Total : 32 M 11 won 16 lost 5 draw
Windies
2019-21 : 13 M 3 won 8 lost 2 draw
2021-23 : 13 M 4 won 7 lost 2 draw
2023-25 : 9 M 1 won 6 lost 2 draw
Total : 35 M 8 won 21 lost 6 draw
Bangladesh
2019-21 : 7 M 0 won 6 lost 1 draw
2021-23 : 12 M 1 won 10 lost 1 draw
2023-25 : 7 M 3 won 4 lost
Total : 26 M 4 won 20 lost 2 draw
* Sri Lanka produces better results when compared to Pakistan and are marginally ahead in performance. Lately, their stocks are going up because of good performances
* Windies and Bangladesh are equally shit, although the emergence of fast bowling in Bangladesh camp creates some hope and in recent times their stocks have been in an uptrend but need consistency and good leadership.
* Similarly Pakistan stocks are all time low on all fronts. Worst home season results due to braindead policies of PCB, Depleted and tiring seam attack due to fitness and lack of work management, Virtually nothing to show in the Spin department and camps within players which is not a healthy environment for any team sport. They rarely turn up for competition in SENA, unless it's English conditions.
BCB is richer than NZC? I am not sure about that. But apart from this, there are a few points that I would consider:
1. Bangladesh and Sri Lanka doesn't even have a decent 4-day domestic competition. They have a Club-based structure, that focuses heavily on the cities of Dhaka and Colombo respectively. On the other hand, New Zealand 4-day competition is around for more than a century and is well renowned for its quality.
2. Stats can be misleading. Bangladesh and Sri Lanka may look better than they are in reality. They prepare dust bowls against SENA nations and thereby win matches. Pakistan rarely uses this strategy.
3. In case of Pakistan, there is a region-based 4-day domestic competition. But PCB management changes every 2-3 years and this results in changes to the format and thereby instability.
Is Sri Lanka better than Pakistan? It is debatable. But overall, given level playing field (i.e no home advantage, no injuries to major players, matches organized by neutral boards.etc), I would say that Pakistan is far better.