Unbound/Volatile Magic gathering tools or Natural Disaster set (thunderstrike/firestorm/earthshaker)

Hi all, i've been wondering for awhile wich of those gathering tools are worth buying right now.I've started playing more recently and i'd like to buy a unbreakable tools, but dont know which. Right now the natural disaster set is on discount 750 gems each tool, being cheaper.Im not focused on anything special, nor will start gathering farm sessions. Maybe sell materials etc.Im less inclined for the unbound since i can farm a bit of them with the berries and i have 2 characters level 80