Another important difference between the two types: Bushed engines are more tolerant of moisture, no after-run oil, damp storage conditions, ect. The bushings will not rust. Great beginner engines.

I have an LA .40 that was given to me by someone who proclaimed it "junk". It's what's powering my 6 lb. Spacewalker II from Seagull models- very scale performance, easy starting, quiet.
I also own two Evo .45's, An older ST. .61, a real old ST. (40 ?)- (never looked into it much, it runs good though) a 15 yr. old Irvine .40 (SWEET!) O.S. FP .25- it's 20 years old, and still going strong, a 2002 Magnum .52 FS, (nice engine, especially for the price) a couple of Norvels, and several Cox products.
I have owned several KB sporsters, (one .28, two .45's and a .65) and they were O.K. as long as you ran a lot of castor in the fuel, but I sold them all before I wore them out. (I know I know, I've heard it all about those things, but truth is, they never did anything but run, and smoked more than any other engine I've owned
One "Leo" that was junk from day one.
One .25 Fox- junk, hard starting, junk muffler, junk carb, did I say it wasn't a real good engine?
One Fox .50 Heli, Yes I said Fox and Heli in the same sentence. It was, uh, "O.K." but nothing more.
I had an Enya .40 once, but it vibrated badly, and never did seem to break in. We planted it on a rock in the middle of the field, and it was done.

I have several older engines that I run once in awhile, but don't fly- McCoy CL Black head .35, a McCoy .29, and a 60's Gilbert .074 (junky quality, but interesting dual pipes)

The Evo's are good engines, and so far no problems. (they aren't the veterans that my others are, but time will tell.) The bushed O.S. are sweet EZ handlers, and make adequate power. The ST's are powerhouses (for their day), and like to be bumped backwards for best starting. The Irvine makes really good power, and is ultra reliable, but is just a bit heavy. The 4 stroke Magnum is an easy starter, quiet, turns a big prop, and gets descent fuel milage, and I have never had any of the problems some have claimed with them. The norvels are good little engines with a fair carb and muffler. The Cox engines are, well, Cox engines, and aquired ability, but once learned, good performers. The others are old, and used for their novelty factor.
I hope I haven't left any out, but I'm sure I have.
Bottom line is I never had a popular brand that wasn't a good engine, 'cept the couple sighted above.

Jetts