Is the price matter for you ? they are at least $10K different. For me, I would still pick 06 E55 and do 63 front bumper conversion which cost around $1K. The rest of the budget you can do some modification and maintenance. Either car is good so good luck !
Good judgment comes from experience, experience comes from bad judgment.
Kleemann ECU tune + Header + CM30 pump + K&N filter + E63 front conversion + SL55 Gun metal wheels