You'll want to pick your alarm installer, not the hardware. Use whatever it is the installation company knows best, there is very little difference in the gear, there is a huge difference in the quality of installations. If you have some specific needs, requirements, or interests, let them know and a good installer will set you up.
If this is a DIY project, ignore the above and make sure that whatever system you consider, its compatible with the central monitoring station you intend to use, and has the software tools available for programming to end users.
PS. All other things equal, 868 MHz enabled gear would be a better choice. The newer standard also includes limiting the duty cycle, so that devices cannot continually broadcast. This really helps in situations where interference might show up. 433MHz equipment may have slightly better range, but in most cases the two are rather close.