The larger radius and faster casting time of Resta makes it invaluable during boss fights like True Darkness and even White Beast. Sometimes a quick Resta will save a teammate from a tail whip or from a meteor strike without having to find them and relocate yourself close enough so that Giresta will heal them.
The bottom line is that you can use or not use any photon art you want. Resta has a unique purpose just like Giresta and although they do overlap they are not meant to replace each other. A true support AT knows that Resta is mandatory while a fighter AT may not have the slots required to use both effectively. There is no right or wrong answer, it is just a matter of being more efficient.
I use both and advocate Giresta as a buff. Giresta lasts for 4 minutes at level 31-40. Each tick (a tick is ~5 seconds) heals 3% of a player's total health. This equates to a maximum of 144% total health recovered during those 4 minutes. Every time Giresta is cast it resets this buffer for everyone within the casting radius, not just the players that have taken damage. Resta will heal any player that has taken damage but not reset the buffer.
The difference is that for a player that is taking heavy damage using Giresta as a heal makes no difference as they are normally unable to build up a large amount of buffer before taking additional damage whereas a player that avoids taking damage has the buffer to instantly heal them in the event that they get hit by a technic or are unable to avoid an attack. If Giresta is cast as a heal for the player taking damage it negates any positive effects on the player that is avoiding damage. This means that any techer casting Giresta will not only overwrite the previous Giresta but they will also reset the buffer for every player within the casting radius.
Using Giresta as your only healing technic is like using a neutral weapon all the time. Sure it works, but it is not the most effective tool for the job in most cases. For newer players this may be considered acceptable but for veteran players it just makes them look inexperienced.
EDIT: To anyone saying that the benefits of Giresta are greater than those of Resta lets take a quick comparison. Giresta has a slower casting time, higher PP cost, smaller radius, adds a regeneration effect and also revives fallen teammates. So that is 3 negative things and 2 positive ones. Let's look at the 2 positive aspects in more detail. First, it adds a regeneration effect which as has been stated is entirely negated if you cast Giresta again. So this positive has now become worthless if a player continually casts Giresta to heal others. Regarding the ability to revive fallen teammates, how often does a player not have a Scape Doll on them? Unless you can cast Giresta the instant a player takes a fatal hit and have them within your casting radius you will not end up reviving them before the Scape Doll takes effect. So once again the positive becomes a null issue. So that leaves Giresta as having 3 weaknesses and 2 rather pointless advantages. If you can only pick one then why even bother with Giresta? Resta is by far the superior choice for healing. Also note that once level 41-50 support technics are released these margins will further widen as Resta's PP cost will decrease and its radius will increase; wheras Giresta will cost more, provide a 4% regen effect and possibly have a small radius increase, although as it is considered a buff I do not think it will increase much if at all (from 21-30 to 31-40 the radius barely moved on all the buffs).
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