When comparing, I believe the bottom line is, does it work for your application? If a 2.4L motor has more then enough power, why do you need an 8L. The same applies to suspension/axles. Its nice to have big axles but, do you actually "need" them or are they nice to have. Myself, I'm hard on my vehicles. I don't do extreme any more but one of my vehicles is driven much harder then the other. My Cruiser has moly axles, reinforced...everything but no lockers. I actually don't need lockers. If I do get them, its just a "nice to have". My Tacoma got new Icon suspension. It sees very little off road, mostly just day trips. Did I need to spend all that money. Yes. The stock suspension really sucked. Its now a more comfortable daily driver as well as off road.
1. What are you going to do? Don't lie. If you say I need a competition rig, are you going to trailer it? No? Are you actually going to race it? No? Is your competition rig also a daily driver? If yes, then your building a street classed race car. I hope its not your only vehicle.
2. What is your prediction for the future? Be realistic. This applies to #1 also but a couple of years down the road. Sometimes its easier to install things you don't need now but will need later. I hate having to rebuild things because I didn't do something when I could have.
3. Again be realistic. Don't put 40's on an 8 inch diff with 18 spline axles. That means, if your going to build something you need to learn it. If your breaking things, its possible you didn't do something correctly or you need a completely diffrent build. If you don't know exactly what I said regarding 8 inch diff and 18 spline axles, you shouldn't be driving your vehicle hard
if your going to just occasionally drive mild to mid trails with moderate tires, there's a bunch of stuff you don't need. You start heavily moding things including tire size or adding a bunch of weight, you need to step back and look at what your building.