For the first 3 or 4 years of my fly fishing "career" I used nothing but Vivas and Sweeny Todds..the only other flies I had were Missionarys..lol. The Viva always caught, no matter what.
As I started to realise there were more flies out there, I bought a few Bitch Creeks (Well, to a young boy they looked fantastic!) and they worked a treat, stripped back on a fast sink line.
Yet I have not used a BLack and Lime Green fly for perhaps 10 years!!! I must be missing something...will tie up a few of those snatchers as they look the business
..thanks for the inspiration!