I got both 3-prong and 4-prong TBs with 15-pt melees from Whiteflash. I love the 3-prong more, because the spacing between melees makes the diamonds look bigger. The diamonds in the 4-prong are stacked close together, so the diamonds do not look as big, and you need more diamond melees for the same bracelet length (so higher cost).
Be aware that Whiteflash sources different settings even for the 3-prong. I got my first 3-prong TB 3-4 years before I decided to get a second one. I love my first 3-prong TB. The setting feels significant, and the diamonds look big. However, when I ordered a second 3-prong 3-4 years later, I noticed the setting was different. The spacing between melees was not even throughout. The clasp was different as well. I did not like the second 3-prong TB, so I returned it for a 4-prong setting. Somehow the 4-prong setting looks and feels a bit “thinner” (with less metal). I do not like the 4-prong, but it was still better the the second 3-prong.
A year later, some lady found my first 3-prong setting from IDJ, and posted her TB online with photos. I compared carefully her bracelet with my first 3-prong and confirmed hers to be the same as my first 3-prong. Apparently, IDJ offers both 3-prong settings, and She had to specify her preferred 3-prong setting. In summary, not all 3-prong and 4-prong bracelet settings are alike.
In hindsight, I would have requested the TB setting to be shipped to me for inspection before letting Whiteflash set the diamonds. At one point, I was thinking about having Whiteflash source my preferred 3-prong setting and reset the diamonds melees, and then put new 10-pt melees in the existing 4-prong setting. Now, I am no longer wanting to make the change, because it is too much trouble and the reset will involve additional cost. Instead, I would get a third TB with larger (40-pt or 50-pt) melees if I decide to get a third bracelet.
One thing for sure is that you cannot go wrong with Whiteflash ACA diamond melees. They are worth the added cost over a regular diamond bracelet from other jewelry stores.