At this point in the lives of the programs, and for what you can expect to learn in color over a few months work, the practical answer is yes.
SpeedGrade has a lot more capability, but ... although it's technically in "hiatus" status, most betting types are betting it will get an EOL statement at some point. I've not heard anything to expect there's any further work to be done with it at NAB.
Learning to work light ... tones & colors ... in video is very different from stills. You have to retrain your working habits, your expectations, and your understanding of the media you're working in. For stills, we "retouch" every potential blemish in the image, essentially frame by frame. That's a horrible waste of time in video, as they fly by, and we only work the things that seem to stand out over time in relation to the things we want to be seen as predominant.
For different things, the different scopes are your biggest friends ... learning how to use them, and to trust them over your eyes in most cases ... takes time and practice.
You can learn and work those things in Lumetri without the steps and time to get out of PrPro to Sg & back. And as you learn, you can test things to see if you want other color tools, whether say some Red Giant plugins for PrPro or what.
For now, Lumetri has as much as you can use and learn.
Neil