As a fairly recent new player (started attending games around Feb/March) I have tried both Outdoor and some games at the Armory. After playing outdoor with the ASA I really didn't feel that the Armory games had the same level of running standards from the Organisers; it didn't feel as fluid or receptive to getting new players briefed and ready, the hire guns (at the time, may well be better now) were also very unreliable (probably due to the huge amount of use they must get).
Whilst you may need to travel further for the outdoor games, you definitely get value for money (10.00am - 3pm + is a good session), the organisation is always of high standard and I have found many of the seasoned players will generally help new people get into it.
I myself still haven't purchased a primary weapon, and choose to get my Camo's, and secondary first and try out different hire guns each induction or game and see what i liked/didnt.
As well as talking to different players at the fields for information about them for when I did come to purchase my primary.