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We perform a detailed study of the grand unified theories $SO(10)$ and $E(6)$with left-right intermediate gauge symmetries of the form $SU(N)_L\otimesSU(N)_R \otimes \mathcal{G}$. Proton decay lifetime constrains the unificationscale to be $ \gtrsim 10^{16}$ GeV and, as discussed in this paper, unwantedcosmological relics can be evaded if the intermediate symmetry scale is $\gtrsim 10^{12}$ GeV. With these conditions, we study the renormalization groupevolution of the gauge couplings and do a comparative analysis of all possibleleft-right models where unification can occur. Both the D-parity conserved andbroken scenarios, as well as the supersymmetric (SUSY) and Non-supersymmetric(Non-SUSY) versions, are considered. In addition to the fermion and scalarrepresentations at each stage of the symmetry breaking, contributing to the$\beta$-functions, we list the intermediate left-right groups whichsuccessfully meet these requirements. We make use of the dimension-5 kineticmixing effective operators for achieving unification and large intermediatescale. A significant result in the supersymmetric case is that to achievesuccessful unification for some breaking patterns, the scale of SUSY breakingneeds to be at least a few TeV. In some of these cases, the intermediate scalecan be as low as $\sim 10^{12}$ GeV, for SUSY scale to be $\sim 30$ TeV. Thishas important consequences in the collider searches for SUSY particles andphenomenology of the lightest neutralino as dark matter.

Roadmap of left-right models based on GUTs