Hello guys , We are going through a huge software using XE7 that will manage and control a big PostgreSQL databases,...

Hello guys , We are going through a huge software using XE7 that will manage and control a big PostgreSQL databases, and i'm really concerned which one i use FireMonkey or VCL  i've been developing on VCL for 5 years and we knew that it's so stable, smooth and sweet platform, :D and it still kicking asses out there, but FireMonkey comes with a really cool new and modern stuff we want them in our software , for the moments we are planing that it will runs only on Windows but who knew what's coming in the few years later , We are worry if the FMX are not mature yet for an huge software !! , and because for the few documentations about the FMX makes us really really on fire !!. any advice guys?
Thanks