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I wouldn't say one or the other is BETTER, just depends on the quality of parts used.
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Now I will say, that in the case of a standard 3/8 pushrod deal, I prefer ball/ball because the pushrods are one piece and you can get them in .180 wall.

Monte,
I have seen mixed comments on the one-piece pushrods. Some manufacturers say the pressed in ends are better because the material can be different for the ends and the separate ends "can be" machined more accurately without thinning out the pushrod when forming the one-piece end.

My new motor has pressed in ends, 0.120" wall, 3/8" dia, ball-ball with T&D paired rocker system. That should be plenty with less than 800 open pressure.
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Features Include:

Highest quality 4135 seamless Chromoly tubing for extreme applications
Straight tube any length
180,000 psi tensile strength
240-degree ball for excellent rocker arm cup clearance
Salt bath nitride surface treatment for outstanding wear properties and strength
Tips are made from high impact, wear-resistant 8620 barstock that is case hardened and cryogenically treated and tempered