Vinyl is actually going to be more permanent than paint when it comes to interior trim. It will resist scratches better, will stretch a bit to expand and contract under different temperatures and overall will just hold up better.

So I'd say Vinyl is the way to go. Paint is going to need touch up, scratch repair etc..

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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium

Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver