Comparison
It depends on your priorities and budget. Both are respectable beginner Maksutov-Cassegrains with identical planetary performance, but they excel in different areas. The single most important differentiator is aperture size. The Sky-Watcher SkyMax 102's larger 102mm objective gathers significantly more light than the Mak70's 70mm, translating to better performance on deep sky objects, superior contrast on planets, and improved ability to resolve fine lunar detail.
The SkyMax 102 scores 5 points higher on deep sky observation, a meaningful advantage for serious visual observers. Conversely, the Mak70 costs half as much and weighs considerably more, which may matter if you plan frequent travel. The Mak70 suits budget-conscious beginners and those prioritizing maximum portability on hiking trips. The Sky-Watcher SkyMax 102 belongs with anyone willing to invest an additional 200 dollars for genuinely better observing experience across all targets except astrophotography, where both perform poorly.
Choose the SkyMax 102 unless cost or weight are absolute constraints. Its optical advantages justify the price premium for anyone serious about visual astronomy.
Why choose Maksutov-Cassegrain Telescope, Mak70
Why choose Sky-Watcher SkyMax 102