LED Strip lights has many advantages, such as flexibility and compact form, suitable for most bulkheads, pelmets, counter and general decorative lighting.
Usually not used as a primary light source, LED strips ideally need to be backed with an aluminium channel or metal flex to ensure good heat dissipation along with structure.
Neon flex is a more rigid alternative similar to strip light however with the added rigidity comes bulk, less flexibility and usually lower light outputs. A positive of neon flex however is that it's usually better sealed for higher water/dust resistance (IP) and to an extent more durable. Excellent for external sign writing in the neon style, or situations where traffic-ability or bare external exposure is a factor.