OK, I won't give an open ended answer for this like "Plant what you like to eat" kind of answer.
In Malaysia, if we look at the commercial aspect the highest prices that a durian can fetch in the market place are the D197 Musang King and the D200 Duri Hitam. Ideally farmers and growers should plant the majority of their saplings with this type of clones while adding 25% - 30% remaining with other clones.
Prices of durians does fluctuate from year to year but in general, these 2 clones will stay at the high end of the price band. As for the future, nobody knows.
Research shows that adding 25% - 30% of other clones especially clones that has a high flower blooms such as the D99 a.k.a Kop Kecil will stimulate higher fruit sets on the main planted clone. In this example, although the D99 clone are not among the sought after clones with high demand but it still has market value and could be sold as a not so common clone fruit.
Decision based on highest market prices are common place but a durian grower would also decide based on selecting a sought after, good clone with medium market prices which makes it affordable to the general public. An example of this is the D160 or also famously know as Musang Queen or Tekka.
Prices of D160 are above average and still commands a following among durian enthusiast. Export market influence is still low for the Musang Queen but local demand for this clone is strong at the time of writing.
Another example of a 2nd tier durian clone is the evergreen demand D24 a.k.a Bukit Merah.
Registered before Malaysia's independence, the D24 had always been among the top clones and once held market dominance before the introduction of the D197 and D200.
This clone still retains its commercial value albeit at a slight tone-down pricing. The D24 is considered as the clone that everyone knows and grew up with.
With the extensive removal or cutting down of matured D24 trees mostly in Pahang and Perak where it was originally cultivated the most, in part to make way for D197 and D200 cutivation, D24 saplings are now back in demand and are being replanted in a number of places. It will find back its former glory for sure.
Rare Durian Clone Selective Planting
I know of some nursery owner and a durian grower which plant rare clone types exclusively at their farm.
The definition of 'rare' could be a combination of hard to get unregistered cultivars (most of it are cultivars from Penang) or cultivars from Thailand and Indonesia.
These cultivars does not necessarily commands a high market price and public demand nor they have good taste but the drive behind why farm owners grow these cultivars is because of its rarity, to establish a personal family collection (heritage), unique physical appearance, conservation efforts or as a scion harvesting source for nursery owners intending to sell saplings of these cultivars.
These rare durian cultivars could be read in detail here.