I'm sure you made the best choice - based on your personal needs. Edmunds Inside Line recently conducted a comparison between the X3 2.8 and X3 3.5.
http://www.insideline.com/bmw/x3/201...rack-test.html
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2011 MINI CooperS BRGII/Lounge Green/Sport/Prem/Connect/Black Xenon/Black Conical Spokes/ACS springs/ACS exhaust/Alta Shorty/Yokohama Advan Sport A/S
2012 M3 AW/FR NDH2/2MK/ZPP/ZCP/ZCW/752/6NR/OEM CF splitters/OEM CF Mirror caps (retired)
2012 X3 35i Titanium Silver/Black ZAP/ZPP/TECH/APPS/Breyton GTS (retired)
2018 X3 M40i BSM/Oyster/ZPP/ZPX/HK/S6CPA/718M(retired)