Unimus is a lot cheaper if you only need to automate a handful of devices, but Solarwinds gets much cheaper as you get beyond about 250-500. I can see you've added more functionality since we were looking at Unimus but its still crazy expensive over time. Unimus pricing at this time is $4,500/year for 1000 devices. We got a Solarwinds NCM1000 licence for something like $8000 (I don't remember exactly) but its a once off lifetime licence, we have the software forever. We lose software support after it expires (which were very helpful but we don't need it now) or we can renew it at a drastically reduced price (far less than unimus pricing for a year)
Solarwinds NCM licenses differ in pricing by region, but for US/EMEA regions, the NCM DL1000 license is $12.000.
This is with 1 year maintenance only. After that, renewing the DL1000 license when out-of-maintenance is $8.000 yearly.
(you may have different pricing in other regions, or if you already have other Solarwinds products)
You can easily verify Solarwinds NCM pricing by Googling "Solarwinds NCM DL1000 price".
Unimus is MUCH cheaper at $4.500 yearly at the 1.000 device tier.
The CHEAPEST Solarwinds NCM (DL50) license, is $2.900.
Unimus for 50 devices is $225 yearly.
In ALL cases (including Unlimited licensing), Unimus is cheaper than Solarwinds.
And while technically you can run Solarwinds without support, personally I don't think running unsupported and unpatched versions of software that is supposed to be your main configuration management over your network is a good idea. Unimus is based on a SaaS model, so you ALWAYS have support when you need it, and you are always running the latest and supported version of software. This is because telling the customer "you need to pay $8.000 to receive support" when you run upon a bug after the 1st year is really scummy (assuming the 1.000 device tier again). Unimus is also constantly adding features, with over 6 new releases each year for the last 3 years.
Not to mention Unimus will just work ootb with all 140+ supported vendors, including Config Push - no need to disable prompt matching, or fiddle with it in any way.
There is also direct NetXMS support through NMS Sync, and the device support list is more extensive than Solarwinds.