Depending on what you want to do with it, some machines have features that might make it more attractive than another (I tried to highlight some of the ones that come to mind for your application. My experience with Taki, WN, Case/Kobelco, IHI has all been positive. Largely I think any of the machines currently available are quality coming from Japan, Korea, USA and Austria. Last thing to consider in my view is that it is always cheaper and easier to rent small mini excavators, so I would spec yourself bigger and rent smaller, rather than the other way around. I would chose wisely, consider aux gpm if you are doing a hoe pac. A thumb would be necessary to pull trees, shrubs and concrete. So being able to compact material back is important. Many times those drains run under existing concrete that owners want put back after you tear it out. I would consider a quick coupler with multiple buckets sizes and a 40" ditch bucket they are priceless for cleaning dirt off grass without damage. After those machines there are none that really stand out as far as capability beyond what everyone else has. It is really handy digging drain fields on slopes and working along side houses where they are always on a slope (or should be), Bobcat still offers an extendahoe option on certain excavators I believe. I would consider the Taki TB138 (zero swing/ zero tail), Wacker Neuson excavators with the VDS option is helpful as it allows you to level the excavator to match the terrain. Personally I don't do anything with Kubota (not that they are not popular, just not my choice). If you have room I would step up to 50-60 sized machine. A zero swing machine would the way to go, even if they are a tad wider than a conv. Assuming you are strictly working with 8' walls with a 12" footing a 35 -45 sized machine would be min. So you could end up needing a good bit of reach. I don't know how you are plumbing for these in QC, but if you are gravity flowing to a French drain than you need to be lower than the height of the wall. Also the walls can be 9' instead of 8', most anything built in the last 20 years is 9' where I am at. While the walls are 8' you also have footings heights of 10" to 12" at least here. Space is always an issue digging around existing foundations.
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