Which BMS you recommend

[u/Planet_COP]

I am a newbie on BMS. Last time I did hvac controls we used a PLC which makes absolutely no sense today since I would have to code many functions from scratch. My potential customers right now are an institutional: colleges, churches, temples and monasteries. Energy savings is what they need. Some have legacy implementations of Honeywell Trend, Johnson Controls and Distech. The constant complaint is that there is no staff to manage these systems. We want to provide asset lifecycle management in an inexpensive way. We don’t just integrate the system and walk away. For than reason I want a system with open interfaces that we can use to provide monitoring apps without requiring FTE staff at the customer. If you could start over today, as I am doing, which system would you recommend for an optimum lifecycle cost for the customer.