Doug, It's probably not fair for me to comment between the 2 since I haven't ever tried the bar with 7 - 8 teeth. I used mine on small saplings and also cutting in a road where I had to cut into a bank about a foot deep. I found that it wanted to dig real well, and took me awhile to get the right place on my level indicator calibrated so that I had just the right angle and didn't dig in too quick. I've used it to knock down some bumps in my gravel drive...when I had the backhoe on. I just tilt it down some, then backdrag. We have a hilly drive with a sharp turn and seems like one of our vehicles is bad about getting wheel hop...and dishing out the gravel...so I've used it to backdrag the wheel hop bumps. It is somewhat like running a comb through the gravel. Backdragging on dirt works pretty well also. I only have a couple inches between teeth...so it will snag up small saplings/roots pretty well. I am sure there are advantages for the other bar as well...where you have 9-10 inches between teeth. That would give you a larger area to use for pushing trees in the 7-8 inch range. ( OK dealers...you can wince at that one...yep, we think they are bulldozers sometimes). One thing I like about the ezattachment bars is that they have 2 strips of metal welded into a V shape which sandwiches your cutting edge and gives more overall strength. The 18 tooth bar is going to run you 1/3 more in cost. More teeth = more things to bump into. Since I am hair challenged.....and tend to run into things with my bald head....I am waiting for the day my bucket is up in the air and I accidentally turn into it. I assure you it is not a matter of "if" but only when. Least I haven't run into any buildings or cars with it yet. But don't teach your wife how to use the fel controls...as it would make a mighty good weapon....and well if you've loaded up on the life insurance policies...you are in double trouble. Your neck would fit between the teeth on a regular bar, maybe buying you a few minutes....but with only 2 inches between the teeth on my bar...I haven't got a prayer.
sassafraspete