What is better Super Kamehameha or Final Flash

The Final Flash and Kamehameha attacks (having been executed by a user who is at SSJ or higher) each present their own strengths and weaknesses.

Final Flash, Vegeta's primary finishing move, has several advantages. The attack is extremely powerful if given adequate charge-up time; as stated by Trunks, the attack is capable of destroying a planet if the user is able to summon enough energy. The attack also has incredible throw distance (as evidenced by when Vegeta attacked Cell the first time, sending the energy beam far into the outer reaches of space), enabling the user to target an enemy thousands of miles away whilst still being effective upon impact. The technique also has several disadvantages. It's greatest drawback lies with the amount of time it takes to charge-up an effective attack; which can be on the order of several minutes. This leaves the user exposed and immobile, thus leaving him vulnerable to attack. In addition, it isn't an add-as-you-go attack, meaning it is only as powerful as the total energy put into it at the time of release. In addition, the target must remain in the same position both during and after the attack is released; this limits is effectiveness to targets who are either extremely bold or the nearly-beaten.

A Kamehameha wave attack has its own advantages. Unlike the Final Flash technique, a Kamehameha attack can be charged-up very quickly; the time required for this is on the order of seconds. While the attack has almost always been executed in a stationary position, it is nonetheless versatile with other techniques; one example of its versatility can be seen when Goku was able to use the Instant Transmission technique whilst charging-up the attack. It's greatest advantage lies in the fact that it is a add-as-you-go attack, meaning that once the attack is released the user can continue to add energy to it to make it more effective; like the Final Flash technique, if enough energy is concentrated into it, it can potentially destroy a planet. Like the Final Flash technique, this attack also has disadvantages. It's greatest drawback lies in the amount of chi required to deliver an effective attack; when attempting to counter another add-as-you-go attack, the user is forced to continually add more energy to the Kamehameha to prevent being overtaken by his adversary's attack. This almost always results in the user being depleted of his energy following the attack, leaving him extremely vulnerable as he is unable to defend himself from any subsequent energy attacks that may come from his enemy. The attack also lacks the throw distance the Final Flash technique possesses, as evidenced when Gohan killed cell; the attack dissipated shortly after leaving Earth's atmosphere.

A question asking what attack is "better" is too ambiguous as it doesn't specify the circumstances at the time the attack is initiated. If a target is stationary and will likely remain so for a long period of time (such as when an enemy has been beaten or nearly-so and needs to be dispatched), the Final Flash technique would seem to be the better choice as it doesn't drain as much chi as the Kamehameha and can be effective at long range; however, if a target is still able to fight or has sent an strong attack toward the user, the Kamehameha would most likely prove more effective.