I like tippet rings because they offer fewer opportunities than loop-to-loop-connections for tippets to get caught on or tangled with.

I like tippet rings because when I am attaching a new tippet I do not need to tie a new knot in (and thus shorten) whatever material the tippet was attached to (level line or shorter section of Amnesia, typically).

Tippet rings come in a variety of size and can be purchased postage free from Streamside Leaders. I prefer the smaller ones for attaching two sections of leader-like material.

As for a fish biting on a tippet ring, if it bites it, so what? A lighthearted take on that is that if a fish prefers the ring to my fly, then perhaps it is time for me to change flies.