Good points above. Something I can add...
There is much of a religious debate on linear vs re-entrant tuning here on UU.
However, some facts my help to side-step the feverish fervor that usually occurs when this topic is discussed:
1. Some music, as written, calls for notes below middle-C, or C4 to be played. GCEA Linear tuning provides for this. Such music that is written and expecting notes below C4 down to G3 MAY sound off, or require some fretboard gymnastics to play those notes an octave higher in the GCEA re-entrant tuning.
2. Physics of sound wave transmission is a consideration. Larger bodied ukes, by virtue of having a larger air volume INSIDE the sound-box of the body, are "usually" better able to resonate effectively in order to produce lower frequencies at an even volume to the higher frequencies. This is because the sound-box and top or face of the ukulele is able to be more "efficient' at projecting the sound forwards into the air. It does not mean that you can't string a concert or soprano with a low-G, but depending upon the specific ukulele in question, the volume and tone of notes between C4 and G3 may be significantly LOWER than other notes, and thus the sound "may" seem imbalanced.
2a. There are MANY variables in build-quality, sound-box design, bracing patterns as well as also the strings you use (gauges and tensions) as well as the technique of the player that can mitigate these problems. A good player will be actively listening and adapting their technique to compensate for any lack and to play in such a way that creates an even and balanced sound, despite the expected deficits that one might expect according to the science of it all.
The main thing is based upon the style of music you want to play, and the sounds that you want to create, please do not be afraid to try it either way in order to see what works for YOU.
Hope this helps.