The heavier strings seem to take a little more room to vibrate, so higher action is needed for them. Also, left hand fingering seems a little bit easier with the center strings are resting a little higher. Since slight changes in bridge height and weight can affect sound and playability dramatically, The Enterprise is available in virtually all heights and many weights. Other makers just cut down standard heights with no regard to the bridge's critical mass requirement. Perhaps the biggest factor in finding a great bridge is to find the magic weight.
Most inexpensive bridges are too light to serve the purposes of professional players.
Thin, light bridges cause the banjo head to respond mostly to high overtones and high frequency noise. The banjo may be bright, but difficult to work with in recording or over a PA system. If a bridge is too heavy, it will reduce volume and produce a darker tone, usually with more sustain. Nechville uses the tried and true bridge combination of maple topped with ebony. Since maple varies tremendously in density from tree to tree - and even from different parts of the same board, you might have to try five or six bridges before you hit one that is the correct weight for your banjo.