Personally, and everyone is going to have their own feelings on this, I'd rather have a well-maintained (records included) high mileage example of a vehicle than a low mileage car that may have sat for long periods. You usually pay much less for the high mileage maintained vehicle because of the way valuation works and most of the parts that are common failure points have been replaced. Sometimes replaced with newer/better designed versions.

Whichever way you go, if you aren't a DIY'er... I'd recommend an aftermarket warranty. On the lower mileage truck it might actually be significantly cheaper to purchase too so keep that in mind.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)