@Vilrein This depends on what you are willing to aim for at the moment and what your goal is.
In the future Techer/Phantom becomes one of your best combinations and options (with a DEX Mag) because of the casting support you get (speedcasting, even better photon point management, critical rate/damage support, and more) and being able to embrace the hybrid melee/technique approach to gameplay. The Techer/Etoile is also viable but it is harder to play without a PP Battery (you can hope to pick up the Genon Talis in Episode 6 to help facilitate photon point recovery) but allows you to be tankier and bulkier as long as you are okay with losing the ability to heal yourself using Resta/Megiverse due to Damage Balancer (each tick would be 1 HP for you and other Etoile users with Damage Balancer).
The following options I would recommend are:
- Atlas EX Eyth - you can easily pick one up via completing five Recommended Quests and getting the present box in them. This will take two days at minimum and will give you an Atlas EX Alz (Gunslash) and the resources needed to Category Change it by visiting Zieg and using the "Change Weapon Category" option. From here you can affix the Atlas EX Eyth with its special S4 (S4: Wand Impact) which will speed up the attack animations and remove hitstun so you no longer pause after each attack connects. This will get a Redux potential in Episode 6 turning it into one of the current top-five weapons in the end-game.
If you are planning on doing this manually instead of getting the freebie handed out to players, you must pickup the Ivlida, Supernatural, Jutus, and Val wands to upgrade them. The Ilvida weapons upgrade to Cleasis and then to Schvelle while the Supernatural weapons get an upgraded variant and lastly the Val weapons upgrade to Atlas. These "upgrades" can be done by talking to Zieg and exchanging them with the provided resources to get the desired weapon. The Lumiere weapons are created by combining Schvelle, Jutus, and the second-stage Supernatural weapons together and Atlas EX is created by combining Lumiere and Atlas together. Keep in mind that the Val to Atlas upgrade requires an extremely rare resource (Chronos Eternistone) that was awarded via the Mission Pass, completing the story, holding a number of titles, and by upgrading a Val weapon to +35 for the first time. These weapons cannot be sold or destroyed (but can be turned back into the Chronos Eternistone or changed into other weapon categories) as a result.
Lavis Cannon - if your goal is primarily to whack things and you are not interested in casting or technique support, this is a very fast wand (faster animations and no hitstun) that shoots a shockwave on every third hit that pierces enemies. It is one of my favorite wands but it has very little support for hybrid play and will fall off in the future due to the upcoming Liberate (Rivalate in Global) weapons taking parts of this potential and applying it as an S5 ability.
Liberate Wand/Rivalate Wand - this is not available yet but will be something you can look forward to in Episode 6 (next week). It has an S4 slot and an S5 slot so you can easily take S4: Wand Impact from the Atlas/Atlas EX Wand and send it here to use it in conjunction with the Lavis Cannon's shockwave (which is the Special Ability Factor for the Liberate Wand). It won't be as fast as the Lavis Cannon but you get both of its features for the most part and you get a generally stronger weapon overall than the Lavis Cannon.
I did not suggest the Lightstream/Trailblazer Wand because I personally do not know how it would compare to the Atlas EX or future wands as my efforts on Lightstream were spent gearing for other classes due to me liking the Wand's S4. The Lightstream weapons do not have an S4 slot (they have S1, S2, and S3) but they do have a special potential that restores all your photon points when you drop below the 10% threshold on your photon points on a cooldown of 120 seconds after it triggers.