For my needs, I ended up choosing Philips Hue to handle these bulbs. I have a Philips Hue hub + about a dozen genuine Hue smart bulbs (some full color bulbs & some simply dimmable bulbs) that are paired directly to the Hue hub. I then use one of the integrations to connect the Hue hub to my Hubitat hub. The Hue bridge is also connected to Apple Home using HomeKit, to my Logitech Harmony hub, and to Home Assistant as well. It is nice having so many integration options available. Philips Hue even added Matter Bridge support to their Hue hub, which opens up even more options in the future.
As for smart switches, I use Lutron Caseta. Like Philips Hue, Lutron's lighting system uses its own Caseta SmartBridge hub. It also offer many standard integrations with other systems, in addition to Hubitat.
I really enjoy the flexibility of using my Hubitat + Lutron + Philips Hue solution. YMMV, of course!
I've been using Sengled Element Classic in lamps since 2017 (first with Smartthings, then Hubitat). I don't have any other bulbs in lamps, so I don't have anything to compare to. My only very minor complaint is that they're pretty slow to react. Maybe newer ones are quicker.
I do have some wifi and Bluetooth and i noticed the same thing. The other thing i don't like with the bulbs is when there's a power outage(Wich happens almost everytime there's heavy wind) when the power come back the lights turns ON wich is annoying as they're in my bedroom
That is one of the nice features of using genuine Hue bulbs on a Hue hub. You can choose how each bulb behaves after a power outage. I have all of mine set to restore to their previous state.
If the lamps are in your bedroom and you want to have some nice, even softer lighting, I chose rgbw bulbs (Philips Hue) so that I could get more into the Orange and Red part of the spectrum, compared to the softer yellows I could get with Philips' Ambience range.
I do not believe it is a standard feature of Zigbee bulbs at all. Hubitat has a workaround in place to help with it, however I do not believe the bulbs themselves are doing the work. I believe the Hubitat hub has to try an figure it out and set the device to the correct state.
I did the following tests with my Hue P45 LWU001 bulbs (bulb only supports dimming):
I use the IKEA Dimmable Light driver with these bulbs, so this excludes any blackmagic that Hubitat drivers might do. I know what the driver does cause I wrote it.
Turn off the bulb from Hubitat
Set "Power On behaviour" to "Turn power Off"
Unscrew the bulb from its socket and waited 30 seconds (to simulate a power outage)
Screw the bulb back on -> Bulb stayed off, no flicker, no nothing
Turn on the bulb from Hubitat to check that everything works, all went fine
Turn off the bulb from Hubitat
Set "Power On behaviour" to "Turn power On"
Unscrew the bulb from its socket and waited 30 seconds (to simulate a power outage)
Screw the bulb back on -> Bulb went on automatically, again no flicker
Turn off the bulb from Hubitat
Don't know about other Hue bulbs, but mine are working as expected. Actually I ditched the Hue hub a while back and had no problems with the 3 Hue bulbs that I have, and they are used every day.
Could I just clarify that you are using IKEA Dimmable lights and these work directly with the Hubitat hub, without the need for any other hubs? I find using more than one hub defeats the purpose of having Hubitat (which works wonderfully with my smart switches).