Re: which lig with my tenor otto link
Go with the F. Louis or a Selmer 404. The Rovner ligs can work well on some mouthpiece, especially one that is perceived to be overly "bright". However, on the Otto Links, which are already a bit dark, it tends to make the sound a bit stuffy, IMHO.
I can't speak about the Oleg as this is one ligature I haven't tried. If you are able to, of course the best answer is to sample as many as possible before you buy.