i have the Trango in #'s 4-7. (the rough equivalent of BD .5 - 2). My girlfriend has a mix of old and new BD's. It's true that the lobes on the Trango are a little floppier, especially in the larger sizes. But they are lighter, cheaper, the stem is more flexible, and the sling is doubled, so i rarely need to clip them with a draw. The BD's do feel and look nicer, but i've fallen on both and they both held.
The smallest Trango i have has the Splitter design. I bought it to replace an older style Trango that got terminally stuck. It has less range at the bottom end because the lobes can't overlap. It can also be tricky to place. Normally i think of the points of the cam lobes overlapping as an ideal placement. If you strive for something similar with the Splitter design it will put you at the absolute bottom of the range, rendering the cam nearly impossible to clean. The head is narrower than the older style Trango and the BD, but it is the same width as comprably sized Aliens or TCU's. Unless there is some other obvious advantage that i don't see with the Splitter design, i would pick one of those (Alien or TCU) instead.