Sengoku Otome: Momoiro Paradox

This one is a girl going to the sengoku period but nth much... Oda Nobuna no Yabou is still the best!! 

Both have the same characters, albeit BASARA is male-centric while Otome (as the name states) is female-centric. The story lines are more or less the same though Otome includes comedy that is lacking in BASARA, and is more casual and light with some added hints of yuri. 

Both have gender swapped historical figures (in Sengoku Otome they're from the Sengoku Era, while in Koihime Musou they're from the chinese Romance of the Three Kingdoms), an almost all female cast with some random yuri and a bit of ecchi/comedy. Sengoku Otome has more plot though, while Koihime Musou is more like a slice of life than anything. 

Well samurai girls are fighting some echi stuff ;DD what could one ask more?  

Similarities: Both were set in the early part of historical Japan. Both have ecchi, history, martial arts, action, parody and magic genre. Both involves a main female character who is a skilled swordsman (or woman for that matter). Both female characters wear little or skimpy clothing. and there the usual fanservice and there is your typical yuri. Dissimilarities: One involves BOOBS, BOOBS and BOOBS, while the other one is more on the exotic sexy side. The chiquita (female lead) in MH weals a traditional samurai sword, while the chiquita (I'm referring to Oda Nobunaga) in SOMP weals a rather long and big broad sword. MH is more of a duo of former clan members who broke away from the clan to do something good for everyone......I think. while in SOMP it involves a ditzy chica (girl) who got into somewhat of weird situation where she has to help a chiquita ( Oda Nobunaga) to conquer the whole of Japan in a noble way........I think. The fanservice in MH is more intense than SOMP. read more 

Similarities: Ecchi, fighting, fan service, a clueless airhead protagonist Dissimilarities: Senran Kagura is about SHinobi in the modern-day, Sengoku Otome is about a girl nicknamed Hideyoshi back to the Sengoku period but in an alternate universe where there are no men and most of the daimyo are hella busty women and Oda Nobunaga is actually a good guy in the series. Oh well not completely devoid of the male species, there is a pervy male dog named Shinku who more or less helps Hideyoshi along the way who only talks to Hideyoshi and can only be understood by Hideyoshi which sometimes make people around here think she has a few screws loose so.....ya. read more 

Keeping with the theme of girls and various other stuff, this anime is also out of the ordinary. 

Similarities: Both main leads (the muchacho from AO and chica from SO) are unwilling people who by some strange chance were drag into another world. Both main leads have no idea what they are in for. Both main leads have no idea that they are getting into someone's nerves. Both has some degree of ecchi in it. Both genre have fantasy and fairytale in it. Dissimilarities: The main lead in AO is a full Otoko, while in SO, the main lead is an Onna. One has some degree of tragedy kind of genre, while the other has a twisted genre form of history in it.  

Both deal the unification of japan under Nobunaga characters as girls. 

Both is an anime about the old era and they both include Masamune Date and Hanzo Hattori. While a girl is sent back in time in Sengoku Otome, there aren't any modern stuff at all in Brave 10. (at least so far into it) While Masamune and Hanzo is male in Brave 10, they are female in Sengoku Otome.  

Very similar humour, cute and dumb girls doing crazy and stupid things. Both also happen to gender-bend famous (historical) characters but it's mostly the similar humour and the cuteness factor. 

They're essentially the same show in different flavors, normal person gets inexplicably transported to slightly off kilter world and fix everything through their unbelievably reliable Mary Sue powers.