There are many types of ukulele available like soprano ukulele and concert ukulele. How do we decide which type of ukulele will be suitable for us?
The critical factor between soprano (standard) and alto (concert) ukulele is size, aka scale length.
Concert ukuleles are longer than sopranos, meaning the physical distance between frets is larger. Depending on your individual fingers and preferences, this may or may not be a good thing. The larger distance can mean that the cramped positions will be easier; however, long stretch positions will be more difficult.
There is also a slight difference in tone (timbre) between the two. Note that tuning is the same between the two (the only different one is baritone).
Note also that while the soprano is the smallest standard ukulele size, if you prefer the concert, you may want to consider the tenor as well, for tenor ukuleles are like the concerts, but larger.