Which is right for me?
Ultimately, the choice of 1x versus 2x really comes down to
personal preference, the sort of riding you want to do and the type
of terrain you intend (planned or not) to tackle, and whether
you'll be loading your bike with bikepacking bags.
There are pros and cons to each: 1x has easier lower gears but
bigger gaps and one less part to fail; 2x has closer ratios but
trickier to get lower gears.
For riding on flatter terrain, it's hard to beat a 2x setup. The
main benefit is the smaller gaps between the gears, and the two
chainrings to adjust your approach to the upcoming terrain and keep
the chain in the middle of the cassette where the gaps are
Lots of people like the simplicity of a 1x drivetrain though and
don't mind the compromise in slightly bigger gaps between sprockets
and sacrificing a bit of range to achieve lower gears.
If you're wanting to ride really hilly off-road trails with
varying gradients and especially if you might be saddling your bike
up with luggage, then low gears are a bonus and 1x simply makes it
easier to achieve a lower set of ratios with the small disadvantage
of slightly bigger gaps.
In summary, 1x makes it easier to achieve lower gears and
provides a simpler setup with one less component to fail, while 2x
suits fast and flat terrain with close ratio cassettes for those
cyclists that demand to be at the perfect cadence all the time.