Both these series are the great examples of epic anime. Either LoGH, either Turn A Gundam give one the huge panorama of life, war, hatred, ambitious, wishes, fate. Although both of them don't content a lot of high speed action and surprising detective plot they are fascinating in its own unique way.
These are stories about peace though lens of war and conflict, with Ledo of Gargantia being the actual soldier conditioned for a life of fighting while Loran is a peace loving young man trying to mediate in a war to preserve the peace he loves so much. There lack of emphasis on actual mech combat in lieu of developing the world around them. Turn-A creates this grand narrative that examines the nature of peace, and Gargantia takes that same message and condenses it to fit within 13 episodes. And yes, both are indeed worth a look at.
Both series has a main gundam that was created generations before the characters in the story. These gundams are superior in almost every way compared to the other modern mechas in their series and are both piloted by the main protagonists who are on their early teenage years. However, the protagonists are very different from each others in personality such as the protagonist in Iron-Blooded Orphan is stoic child soldier while the one in Turn A is a curious compassionate worker. Both series also has a princess but from different satellites; Iron-Blood Orphans has a princess of Mars and Turn A has a princess of the Moon. Their are also small hints of romance between the main character and the princess in both the series. read more
Both shows involve a young man using a Gundam from a conflict years (or in Turn A Gundam's case, Centuries) ago to fight for an organization. Also, both feature a princess from a planet that isn't Earth.
In the last few episodes, I confirmed that So Ra No Wo To was near Identical to Turn A Gundam. In the opening episode, there is alot of symbolism with the angel of destruction and the fortress maiden ritual that happens also in Turn A Gundam too.
The overall world was similar as well. Both worlds had/are recovered/recovering from near destruction with the introduction of some over-powered technology.
Both series have very little action as well and are more character based.
Two teenagers are plunged into strange and alien worlds, shortly before said world plunge into conflicts involving mecha. One of them is a girl from 90's Japan who ends up in the fantasy world of Gaea, the other a boy from a far future Moon-based society who is sent to a less advanced Earth.
Both of these are Sunrise originals made in the 1990s, with cel-based animation, unique mech designs, and soundtracks by Yoko Kanno. Each are absolutely worth checking out if any of the aforementioned plot/production details are of interest.
The shows introduce two warring factions, for turn A It's earth vs the moon race, for Reconguista it's the Capital vs The Amerians(so far) both sides have thier own MCs. There are also references to previous Gundam series in the timeline (both anime feature older mobile suits) despite having their own unique century.
Technical things aside, the overall direction and atmosphere are similar with both having goofy bits along with drama.
Both shows are directed by Yoshiyuki Tomino, the father of the gundam franchise and mecha anime visonary, and both shows are him at his most lighthearted, but also at his directoral best. Both shows follow a group of really likeable young people through a spanning war. In Turn A, it's about going back to your roots, and in L.Gaim, it's about rebellion and trying to find your place in the world, as well as following your destiny. Both shows feature a great deal of humor and are both genuianlly funny, because you really start to like and care about these characters. Neither show really focuses much on the mecha either and are more character dramas/adventure shows, so those usually uninterested in mecha anime may find these series easier to get into. read more
When watching Brain Powerd, i couldn't help but think about another Tomino series, Turn A Gundam. Both shows have a lot in common, plus they both share some of the same voice actors, and a score by Yoko Kanno.
A single mysterious ancient mecha is found in ruins, which is far superior to every other modern mechs or weaponry, that the main protagonists operates. There's also a minor romance subplot where the main heroine (whom are also queens) has romantic feelings for our male protagonists.
both occur in a post-apoch world setting involving the use of past technologies in order to survive, and require the discovery of ancient secret technologies to continue their civilization's lives and hope for the future.