I have done quite a lot of research on this subject when I was planning and begin building my Cuda. IMO torsion bar front is very adequate for 99% of use however I went with a triangulated 4 link rear. A coil over front end offers more adjustability but unless you are building a real race car it is probably moot. Keeping in mind that T bar cars were and are raced quite a lot as well.
In my case, my car is super rigid as I have a lot of bracing, full sub frame connectors, big T bars, big front sway bars, poly bushings, etc. I would say that for "putting power to the ground" specifically in the rear, a 4 link or perhaps a 3 link is most advantageous if you are running a solid rear axle (versus an independent rear). The problem here then becomes handling which is where a triangulated system or pan hard bars come in along with sway bars. Everything has its pros and cons, you need to determine what meets your needs. Obviously a leaf spring car can be made to work and work fairly well, however the "link" systems have proven themselves to be superior for handling but do have other issues (ride quality being one).
