I have a Toro ProLine 21" with a 2 cycle Suzuki, and an older LawnBoy 21" commercial machine (just before Dura-Force engine era). The TPL replaced the LB when the LB had a transmission problem. I work solo and use the TPL as the primary hand mower, but also put the LB on the trailer for about 8 jobs each week.
The LB covered about 3500 lawns before the tranny problem, and the TPL has covered about 1700 in the past two seasons.
Pro:
TPL - great engine, runs great, very efficient
- mower is heavy duty, built very well
- wheel drive is very sure, "feel" is very solid
- large bagger
LB - light, easy to handle
- bags very well in wet grass, or heavy/tall grass (side bag only)
- can use side or rear bag, either bag very easy to empty
- works moderately well for side discharge (not many clippings)
- always first-pull start
- deck underside keeps itself reasonably clean
- quality of cut in better (only reason I use it on certain lawns)
Con:
TPL - does not work well in heavy/tall grass (clippings get caught easily in the chute
- cannot discharge anything! (borrowed a left-side discharge chute, and found the operation to be of little value except when clipping count is low, and then I could use mulch mode anyway)
- underside of deck does not keep clean very well; grass build up around kicker-plates
- quality of cut should be better for most lawns
LB - some parts are not very sturdy (e.g. ground drive cable - good for only about 200-300 lawns before breaking)
- drive wheels don't last very long
- height adjustment levers are not very sturdy, subject to changing positions while working
- extra time required to change from bagging mode to mulching mode (not much of a penalty)
- noise! (I know the newer Dura-Force engines with muffler on top is quieter)
- staggered wheel design does not permit edge cut on the right side of mower; also it makes the total width of the mower wider
I like the Toro ProLine, but will probably buy new LB in the off-season. I'm not unwilling to pay the high price of a Toro, but I like the quality of cut the LB provides. Despite the very heavy use of the LB over the past six years, it still works pretty well. But will not want to put more money into replacement parts.