tangent theta

New here — posting so please disregard if this has already been asked. I'm in the market for a new scope and I'm strongly considering both TT and ZCO. I'm mainly trying to figure out which one would give me the best low-light visibility. I'm currently running a Swarovski X5 5-25 and I'd love to...

Looking at some alpha glass for a long range hunting rig. Interested in hearing everyones opinions on both the swarovski z8’s and the tt315h. Currently have a z5 3.5-18 would love to know what one could expect from making the jump to the next “tier” of glass?