User blog comment:Tenebraeh/Free Unit of Choice Question/@comment-26347196-20160328173727

For my opinion, here's my recommendations, depending on your needs.

First, if you are lacking squad efficiency, I suggest you getting units that have the most buffs, so you can have more utilities in the long run. This includes Charla and Allanon, and if you research them thoroughly, you know they're literally beasts in terms of takng multiple roles in one unit (Charla has about 8 buffs in her BB/SBB while Allanon has 9).

Second, if you think you have enough buffs, go for nukers, or just simply go for more potent buffs. For nukers, there's Gildorf and Nyami (though there's Rize for FH/FG). For potent buffs, perhaps just look at the units from the latest batch, though I might recommend you to look at the Eneroth batch as well (Also, watch out for the upcoming Omni Evolutions from 6 Heroes, as they do have some mad buffs *cough*Eze*cough*). For normal attack nukes, I might suggest Avani, though you have a lot of variables (some other mentionables being Zenia and Zephyr as he get his 7*).

Thirdly, arena. Challenge Arena. For this, you really want units that have Angel Idol proc on their ES, meaning there's Charla, Ivris and especially Phoenix (though similar kind of ES includes Quartz, Vermillion and Isterio). Secondly, leaders. You might find great arena leaders like Rahgan, Hadaron or Avani.

For newbies, there are two ways from this. If you are roughly lv100, you are stepping into the harder contents, meaning you should have a mitigator. In such case, I might recommend Lafiel, Laberd and Krantz. Second, if you are very new, you might want to look at units that gives BB utility. Sample units that come to my mind are Elza and Reud, but that's just the tip of the iceberg.

Lastly, you night want to go for units that can help you fulfill more roles for Frontier Gates, especially Bound to Something. If all else fulfilled, go for what you like =))