Two 3" F7 Achromatics... BORG K10-76AB vs. MIZAR GT-80S:
BORG is about half the weight, has those flexible modular tube sections, and a 4-slot eyepiece turret with quality rectangular mirror diagonal.
MIZAR is traditional, beefy (TAK'ish hardware & weight), and has that high quality look & feel.
Both scopes can use 2" accessories. Both have rack & pinion focusers (Mizar is smoother). Both have coated optics.
BORG uses a cemented doublet. Mizar is a standard air-spaced.
The Views: Very Good low-power / wide-field from both. Mizar has less CA at mid & higher powers.