And what if I use only the recorder in the indoors scenes where I see that there is too much reverb noise? It could be a good solution? (Obviously I first eliminate any other noise in the room)

@JP_91 I wouldn't recommend any recorder only set up. You will not reduce reverb but pick more of it up for very simple reasons. Further the mics on those devices are usually no where near the same quality as a dedicated microphone, plus the self-noise will drive you crazy during post.

I don't mean this in a bad or negative way but I strongly suggest you read a basic audio/location-recording book as the questions you are asking seem to betray a complete lack of fundamental knowledge regarding this topic. You will be doing yourself a big favor and will have more confidence making your choices.

These two books cover most of the basics (there are many others which Google will help you find):

http://www.amazon.com/The-Location-Sound-Bible-Professional/dp/1615931201/ref=sr_1_sc_1?s=books&ie=UTF8&qid=1366139806&sr=1-1-spell&keywords=locatioon+sound+recording

http://www.amazon.com/Producing-Great-Sound-Film-Video/dp/024080970X/ref=la_B000APKOEM_1_1?ie=UTF8&qid=1366139846&sr=1-1