Splitboarding is relatively new compared to ski touring, and only in 1994 did the first splitboard DIY kit come to market via Voile. Since then, the sport has exploded in popularity and we now find ourselves in the Golden Age of splitboarding and ski touring gear.
Choosing the ideal splitboard should be based on your objectives (where and how you intend to use your setup most often), and your abilities and size. The board you choose will determine three things: float, maneuverability and edge-hold. Basically, a longer, wider splitboard will offer better float in deep powder conditions, and will provide more edge-hold. The tradeoff though, is that it won't turn as easy and will probably require you to take wide arching turns. Conversely, a shorter splitboard will turn easier and lends itself to making tighter, quicker turns, with the tradeoff being it won't float as well in powder or have as much edge-holding ability.