There are three main types of belts;
All-in-one Systems (~$8-12 / Set)
Pros: the flag system is easier to repair as one could sew new flags to the belt if ripped and tattered. Places consistent flag separation around the waistline due to flags being fixed to the belt. Very few parts to the system, it is one belt with attached flags so no clips or flags getting lost at the field or transport.
Cons: clip fails with frequent use and over time allowing belts to just fall off. Additionally, these belts tend not to fit well with bigger lineman. Cheaper versions of belt are significantly low quality
Flag Belt with Detachable Flags (~$9-12 / Set)
Pros: Better for big lineman as the belt stays attached and won't easily fall off, an audible sound can be heard when pulled, and easily adjusted for 2 flag or 3 flag play.
Cons: Parts of the belt system like clips and fasteners can fail/break rendering the belt unusable until it is repaired. All parts of the belt are modular meaning they can be lost and left at the field.
Uniform Flag Combinations (~$15-20 / Apparel Item)
Pros: Eliminates the need for belt apparatus and the problems that can come from attaching and breaking. It keeps flags separated along the waistline. They ensures players have matching components of a uniform, either shorts or jerseys.
Cons: Velcro can degrade making reattachment difficult. It is hard for a team to “own” a set, rather each player must be sized accordingly and must purchase this system from a limited supplier. Additionally, if shorts or jerseys are low quality, the actual material will rip as players are more likely to grab at the clothes than the flag.