OP, I had a 550i GT for one year. Had an E92 M3 for a year, then an X5M for a year and now I got an 08 e90 M3 with 6 MT and kept the X5M. I loved all these cars.
The x6 rear seat is as big as the M3. The x6 has an artificial price premium over an X5. In contrast, the GT is the most undervalued BMW today. You can steal a 2010 for 37k. Loaded.
The GT is beautiful, refined and feels like a big car. The x6 is crammed inside, it is like a fat 3 series.
Daily life will be premium comfort in the GT, and X6 life will be impractical but super exciting. The X6 trunk is stupid. You need 8 feet clearance to open and close. The GT has the convenient half trunk.
I would recommend cross shopping: 7 series, GT, X6, X5.
The first two are autos and have as such not fully independent rear suspensions. The latter two are all-weather trucks with phenomenal rear suspension setup. The GT tends to break loose a little over uneven surfaces in fast sweepers. The X5/6 variants are grounded.
I hope this helps.
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