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I would tend towards a "no" answer. I know astro-newbies are often obsessed with magnification, but higher magnification doesn't necessarily mean better or more detailed views.
The amount of detail a scope can show primarily depends on its aperture. Magnification, being the ratio of scope and eyepiece focal lengths, is a two-edged sword. Higher magnification means, most visibly at first glance:
- dimmer view
- more unsteady view
- more obvious optical aberrations (colour, coma, depending on the type of scope)
- objects moving out of the field of view real fast
The focal length range of eyepieces is limited for practical reasons both at the long and the short end. Any given set of eyepieces will give higher magnification and narrower field views in a long focal length scope, and lower magnification, wider field views in a shorter focal length scope. However, the sweet range of magnifications and fields of view can be achieved with most scopes and commonly available eyepieces.
You won't be missing out at the high-magnification end (I'm guessing about 200x for these scopes) regardless of whether you pick the 750mm or the 1200mm. Most often you will miss out on high magnification because of less than ideal seeing.
So, forget magnification, it's not really a deciding factor. I reckon you need to weigh between the higher visual quality, contrast and lower aberrations of the 1200mm scope and the smaller size, lower weight and easier mounting of the 750mm scope.
If at all possible, try and check out those scopes in the flesh before buying, better yet, try to look through them at a local astro club's observing night.
Cheers
Steffen.
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