Hi Folks,
So here is the current landscape versus and what I think I need. Options and opinions appreciated

I'm in a new house and pre-wired for alarm. I want a broadband and gsm solution. Not sure of my gsm connection so want external gsm aerial (i presume) and also a parallel broadband connection.
Got quotes off local companies. Most seem to be pushing HKC. Most seem to be trying the yearly maintenance charge for various reasons (faults, call outs servicing etc).
Afer some pressesing (based on a friends recommednation) some will quote Vanderbilt. Some will back off on the yearly servicing. I only want an if needed call out.
I want a future proofed solution on an alarm system such as poe camera, home alarm, gates, andriod phone app etc. Maybe not today but maybe for tomorrow. All options on HKC and Vanderbilt sensors and control panels don't seem to be a whole lot different to what you would get 20 years ago.
I did see a thread on this forum and moved to IOT forum, on a wireless Ajax system which seemed to be modern. At the same time I've seen comments basically saying if you are wired go wired.
So in short what would be good recommendation for a good future proofed wired, integrated alarm system ?