Re: Favorite bass fly
This probably doesn't answer your question. I don't worry so much about specific patterns for bass. They'll eat anything. I like flies that have a lot of motion & provide a good profile. If it looks alive, it's a good bass fly.
I like big flies for bass, most in the 1/0 to 3/0 size range, 4 to 6 inches in length. I do add weed guards to some flies. I like the 2 prong mono guard like you might see on flies tied for Bonefish or Redfish, and I like a wire guard, either a 2 prong type that shields the bottom of the hook, or the folded type that fits to the hook point. The type depends on the cover. The heavier the cover, the heavier the guard. This means I'll tie the same patterns with different weed guards.
I don't have a single favorite pattern, but have some favorite styles I've used for many, many years. I like poppers & sliders for topwater, Lefty's Deceivers, Seaducers, & Clouser Minnows. (Include Half & Half's here too since they're a combination.)
Favorite base colors are white, black & chartreuse. I've had the most success over many years with these, either alone, in combination with each other, or with other colors.
White is always good as it's the primary color of most baitfish & juvenile fishes. I add shades of green(olive), gray, and other darker colors for backs to mimic various baitfish. Black & white, and chartreuse & white is always good. Most such baitfish patterns I'll tie are generic, and can imitate many species.
I tie a lot of flies in black, as it's something that works well in many water clarity conditions and there are many things that are dark in color that bass will eat.
For flies such as Deceivers & Seaducers, I also like to tie them with different hackle in the tails. Sometimes I'll use saddle hackle, sometimes neck hackle. I'll tie the hackle flat on Deceivers or splayed out, like on a Tarpon fly. Gives different profiles & motion. I used to tie Tarpon flies commercially & this one detail makes a world of difference. Guides told me that flat tails makes a more defined profile, while splayed tails makes the fly appear larger than it really is & adds more movement. Small details, but easy & inexpensive to incorporate.
Typically, you'll see Seaducers tied with thin saddle hackle, which is fine, but I also like wide neck hackle as a tail tied splayed. This style of fly is very simple & by changing the tail hackle, a different appearance & motion can be obtained making it very versatile. It's also cheap to tie since strung neck or saddle is all you really need.
I also use many other patterns for bass. I like variety & like tying with different materials. I particularly like natural hairs such as rabbit, fox, skunk, opossum, coyote, etc. All of these work well incorporated into bass flies.
Remember, no one likes to be behind the big truck, but that's better than being under it!