The best missile for the AD is arguably the SAMP/T in terms of cost to benefit ratio. Me,
@Gen3115,
@Azull, Striver, and a couple of others talked about it out of boredom.
As much as I like the MEADS/Patriot series (and arguably the fact that the PAC-3/4 blows the SAMP/T out of the water is terms of ABM capability), the fact that a lot of the TNI-AD's existing GBAD infrastructure exists on a network based around Thales architecture (Think the CONTROLMaster for the Starstreak and Mistral) it would be cheaper and more streamlined overall for the TNI-AD to get either the Crotale NG or VL MICA for MRAD and the Aster 30NT SAMP/T for HIMAD and ABM duties. At the end of the day what we should be looking to do is an TNI-AD CEC like system that work in conjunction with a larger network of IADS among the tri-services. And although you can still do it with MEADS/Patriot it would just be more expensive to to integrate all of them together as you would have to pay both Raytheon and Thales integration costs.
The fact that it's a a huge probability that the Navy is likely installing the Aster over the SM series (along with the VL MICA already onboard the Martadinatas) means that the services can rely on a common pool of missiles when it comes to GBAD/IADS. Think Singapore and their Asters.
I wouldn't know where to begin when it comes to the newer S-400 system (no one does, and if they do they are either breaking the law or lying). But if the export variant would lead us to somewhat similar (but improved) performance to the S-300, then we can thank the Syrians for demonstrating how colossally terrible they are. And that's coming from a system that's (partly) integrated with other GBAD's such as Buk, Tor, and Pantsirs. It would be even worse when it comes unintegrated with existing GBAD since all of ours are Western made.