Appreciate all the responses, as I have learned quite a bit in the past few days regarding D1's, and Defender 90 axles.
For understanding sake, I have a few more questions. Red answered most and gave me some understanding on strength and tradeoffs, but it seems like 24 is the way to go if you plan on doing upgrades later? (which I am not really interested in as of now) This is not really brake related, but more questions regarding future proofing.
1. Are folks enticed to go with 24 spline because they are newer, and more upgrades are available? Lockers, Aftermarket Axles, parts availability?
2. Are there some 24 spline axles that are indeed stronger than the 10 spline from factory?
3. Is it simply opinion of different shops/forums on one over another regarding an upgrade?
Google allowed me to become more confused,seems like every forum covers this question one way or another...here are two articles elsewhere not forum based.
ECR 24 spline upgrade article
Ashcroft test