I can appreciate the confusion in the answers you have gotten. I knit in the Continental Combined Method. Annie Modesitt is a great place to start.
I just recently have learned to use an Eastern Uncrossed purl to work in the round. Combination knitting in the round is literally the same as Western in the round, usually. The reason for this is that a Combination purl is a full twist, therefore stacking row on row of purl stitches gets very tight very quickly. Unless that purl is followed on the next row by a Combination knit (through the leading leg, which will be to the back, not the front) it will remain twisted. I was blessed to find a group on Facebook just for this style of knitting. It was there that I was introduced to the Eastern Uncrossed purl. Similar to a Norwegian purl in the sense you make it through the back of the stitch, but with a lot fewer movements and the difference is the direction of the yarn wrap. It is has a quarter twist, not a full twist, so you can stack row on row of purls without it tightening up. So much faster than a regular Western purl. And your stitches will be much more even with a better tension.
This is still a method of knitting that has few hard set definitions, and I like that. Most people knit this way because they do it naturally, like Annie, or learned from a grandmother (usually German). The definitions are still very loose and people like to talk with authority that just doesn’t exist. In my own mind I think the name explains it all the best. We “combine” two different methods to make a fast, ergonomic method. So using a Western knit with either a Combination purl or Eastern Uncrossed is perfectly acceptable.
And the fastest knitters in the world knit Lever style, aka Irish Cottage knitting, developed by women who knitted to feed there families, usually when walking to and from different chores. Their were it for the money, honey, so better believe they knitted quickly!
I don’t know how experienced a knitter you are, but I would recommend Knitting in the Old Way by Priscilla A. Gibson-Roberts. It has a great section on Eastern, Western and Combination knitting. Not a beginners book, but if you enjoy European ethnic knitting, it is a valuable resource and will help take your knitting to the next level.
Also, anything you can do in Western or Eastern you can definitely do with Combination. I am currently knitting my way through the Japanese Knitting Stitch Bible by Hitomi Shida using the Combination method. Since the main difference between Western lace and Japanese lace, that I can discern anyway, is using a lot of twisted stitches for definition, the understanding of stitch construction that I have from using Combined has helped immensely.
Honestly, I highly recommend the Continental Combined group on FB as a great place to start. No arguing about terms or minutia like the Ravelry group. I learned sooooo much from that community. Pretty much the only reason I stay on FB, to be honest.
Good luck, happy knitting and enjoy the journey!