Ultraman R/B (2018)

The older brother of the Minato brothers, Minato Katsumi was quite similar to Madoka Daigo who is the protagonist in Ultraman Tiga. And if you love R/B's plot and characters, you'll definitely love Tiga as R/B did draw a lot of reference to the series. You might as well call R/B as a series homage to Ultraman Tiga.

As I mentioned in my Tiga recommendation, it was also the same as for Ultraman Dyna. Since as with Katsumi, R/B's Minato Isami/Blu also had a lot of similarities shared with Dyna aka Asuka Shin. And alongside reference to plots from Ultraman Tiga, R/B also contained a lot of parallels from Ultraman Dyna as well. So I'm definitely recommending both series because of the huge homage R/B had in connection to the series.

Both are contemporary hero shows, that aired around the same time, focusing on a pair of characters - the Minato brothers in R/B and the "best match" guys in Build.
There are also fourth wall breaking "previously on" segments for both shows.

The biggest difference, at least in my opinion, is that Ultraman R/B has multiple, actually well-written female characters. (And it also does not have a 29-year-old man/19-year-old woman relationship.)

Both shows center around a family of five consisting of an older brother who sacrifices his own interests for his family, a younger brother trying to make something of himself, a younger sister still in high school, and a father a bit on the eccentric side.

The two shows are also rare entrants in their respective series with dual protagonists. Revice having Revi and Vice and R/B consisting of Rosso and Blu.

The heroes in Revice also use inner demons to transform, sort of like how the Ultras choose a human as a host.

Both are written by Junki Takegami (he was co-head writer on R/B) and feature a sibling team that fights monsters while living with a single father.