Not sure how they would fare being non-modded since I had the Denon's done by Mark a couple of years before I got the TH900's - in stock form the TH900 had less precise bass, which Lawton's mod took care of.
As to why I preferred the LA7000 - multiple reasons - there are way less LA7000's around, mine are unique with many mods - a 5' Q French silk cable, HD650 headband pad, Lawton pads, a very rare and unique set of deeper than stock Teak cups from Thailand (possibly one of a kind from member Lohb) on them that are immaculately done (the finish is as flawless as you can dream wood can be finished), were my first TOTL can - back in the day they were among the best available on the market - shows you how far this hobby/business has come in the past 5 or so years, and sound-wise, they were more well rounded to my ears - better mids than the TH900 had when I was doing A/B comparisons - female vocals sounded better to my ears. Bass on both is incredible.
Look, the TH900 is an exceptional headphone, the delta between it and my LA7000 was so close it was pretty much a push so I went with the more balanced sound along with the cosmetic and rarity reasons listed above. I'll likely keep these till I hand them down to my grandson................
Looked for a picture of them to no avail.............I need to fix that oversight! They are at work and get used daily so can't snap one till Monday.