In addition to the Enterprise being possibly more maneuverable or at least faster it might say something that the torpedo pod and extra phasers are an add-on to the basic Reliant design.
Oh, as for "The Battle" we can see that there are no visible tubes ala Enterprise neck area on the Stargazer. I boosted the levels in the screencap so you can see that they are covered over, top and bottom. Her torpedo tubes were probable TOS-style, in the lower saucer.
