Samsung updates their OS roughly once a month and is usually on the latest patch level. Security-wise, they’re top notch. Now for version upgrades, that‘s a different story. It‘ll be roughly March 2020 until the current Note line-up gets the next version of Android. Usually not a big deal as Google is rather slow in terms of adding new break-through features. Especially since the launch of its own Pixel line - many of the new features tend to be reserved for those phones. But even with that - Samsung has been very good with version upgrades as well. They‘ve updated everything back to the S8 to Pie in early spring this year. Considering the fact that Google didn‘t release pie to the OEMs until late October 2018, that really wasn‘t bad. I mean Apple runs several months of public testing before the final version upgrade is ready and only updates once a year as well.
Android‘s (well-deserved) reputation of lacking prompt version updates mostly pertains to the gazillion of ultra-cheap entry-level phones. Those, of course, are the biggest part of the Android market and when you read that „only 11% of all Android phones are running 9.0“, it‘s those phones that drag down the numbers. If you look at how many S8, S9 and S10 phones run the latest version of Android, it‘s close to 100%.
Companies like Samsung, Sony etc. have been updating their mid- and upper tier models at roughly the same pace as Apple for several years now.