I disagree, at least in terms of the two subframes listed. The bottom set is tubular, but is clearly inferior. They are very short. Also, it looks like they really are the bolt in style, and there are no seat braces. For all three of those reasons, the top set wins regardless of any negligible advantage a tubular bar might add. In fact both sets look to be far on the cheap end of the spectrum. That at least answers the question posed by the poster.
Moving on the the theorical question of which style of subframe connector is best, which the poster specifically did not ask (in fact he asked people not to digress beyond the two subframe connector set listed), I think Methodical and Killercanary are on the right track. But I would say the things to look for in subframes (in order of significance) are: (1) weld in, (2) full length, (3) seat braces, and finally (4) brand or style (as in box or tube).
I think anyone with subframe connectors would agree that they are an important mod. Possibly one of the first 5 mods to make (certainly top 10) regardless of goals for the car. That said, don't cheap out on em. The difference between the cheapest set and top of the line is less than $100.