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The OTA, Optical tube assembly, is basically the same for the Newtonian and the Dobsonian. The price difference will be the mount. Note how my second link varies in price from 250 for the OTA to 1000+ for the OTA plus a fancy mount.
Equatorial mounts have there uses for non computer controlled systems but the EQ2 is rubbish. It gets really floppy and wobbly really quickly. And the setting dials aren't worth looking at. My scope was 600, with the OTA at 200 and the mount at 400, telescope pointing is so crucial to the experience that the mount and tripod should be a major concern for purchases.
The particular arrangement is less important than the machining and quality of the components in the drives and bearings, much like bikes!
Backstop
Possibly showing my lack of knowledge here, but what's with the price difference and the same size Dobsonian that I have? (https://www.widescreen-centre.co.uk/sky-watcher-heritage-130p-flextube-parabolic-dobsonian-telescope.html)
It's still an Alt-Azimuth mount but just offers finer control? I mean they also have an similar EQ mounted scope for cheaper here: https://www.widescreen-centre.co.uk/sky-watcher-explorer-130p-parabolic-newtonian-reflector-telescope.html
I'm sure there's a valid reason for the pricing, but it just seems odd that (admittedly at a glance) that you're getting a similar scope with an alt-azimuth mount and paying more than an EQ mount. (I know very little about the various EQ mounts, the one linked is an EQ2 so may be complete trash for all I know)