I think this is really a matter of choice. Personally I have spent so much time flying in the RHS that sitting in the LHS feels quite strange!
From a practical viewpoint instructors are taught fairly early to consider the 'parallax' problems. Regarding reaching the fuel cock in a PA28 I do not find this a problem (although I am quite tall I suppose).
If you feel safe and in control in the RHS then it is up to you (insurance clauses permitting).
Just a thought from the 'RHS'
JWF
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