The track and joiner questions depend on tons of things.
Using better clamps, grease, stainless vs brass, etc. all mitigate the problems of getting the power to the loco.
The issue is that if you "commit" to a solution that is not "good enough" then you can face a significant expense to a different solution.
In my case, I knew I needed DCC, and I had read forums for years before I started a layout. So I heard all the stories, some true, some false. Many people who made the wrong decision covered it up to avoid embarassment, and many gave up on track power and went battery in frustration.
So I built a small loop in the back yard of 3 different manufacturers' track, and quickly learned that brass oxidized too rapidly, the Aristo and USAT joiners were crap and loosened, and "fixing" an oxidized joiner was a whole lot of work.
Now the budget came into play... could go brass track, and either use bond wires between segments, or expensive clamps, but I still had the oxidation problem.
So, I made a loop of stainless steel rail... NIRVANA!..... did this 20 years ago, made the financial committment bit by bit, and 20 years later still in nirvana.
So, make the right decision for yourself the first time, take you time, consider your budget, but the track is the foundation of your layout.
Greg