Both options let you pack your boat as luggage. You don't lose much in handling, and storage and transport become much easier. Folding and breakdown kayaks are generally more expensive than hardshells, but you don't give up much in performance and they work great in most conditions. You may want to add a rudder if it isn't included in the package. Tandem boats are challenging to turn even with the best sweep strokes.
Rudders help solos stay on course and aid somewhat in turning, but they also cut into hull speed.
A well-executed sweep stroke with a lean is more effective for singles than for tandems. Hatches are necessary to access storage space that is sealed off by a bulkhead, an option on most commercial models. In addition to storage, bulkheads provide buoyancy and displacement otherwise provided by flotation bags fore and aft. Manufacturer's suggested retail price.