Some people like Chevy, Ford, Honda, Toyota, Hyundai, Tesla, and never owned the other brands to compare. Same with glow engines. The fact the OP said he's owned many and feels he's not an expert, and asks for random input, just seems odd to me. Three times he bashed OS in the thread.
I've been in the hobby for about 40 years myself, from control line to RC, and voted Rossi. Saito wasn't on the list.
Haven't enjoyed the cost of Rossi glow plugs, or their fuel consumption, and certainly wouldn't throw an OS in the trash either. Not a K&B fan, not an Enya fan. Not for RC. They were great for C/L. OS were always disposable engines for me, run them two seasoned and dump it fast on Ebay before the engine wears out. Not a nickel fan. I had 7 years on my Rossi, ran like new. Nowadays, I'm just too much a 4 stroke guy. Easy on fuel, easy on my ears, and I don't even need a glow starter. I like back flipping the prop.