not too many people will be able to answer to you this question since it's pretty i believe rare to get one person that tried or heard both on the same table.
rb300 is unadjustable minimalistically designed arm with rigid and straight armtube and fixed headshell. this construction has theoretically the minimum vibration inside its structure. rb300 minimalistic design demands a maximum precision drilling from armboards and from turntables at the same time which is nearly unrealistic.
sme3009 is s-shaped tonearm with detachable headshell and fully adjustable azimuth, vta, anti-skate but sophisticated and consists of too many joint parts that can invoke unwanted resonance due to its mutual vibrational interactions.
in general still more success can be acheived with rb300 but there could be some problems such as misread or distorted inner grooves, problems setting up the correct anti-skate.
rb300 is unadjustable minimalistically designed arm with rigid and straight armtube and fixed headshell. this construction has theoretically the minimum vibration inside its structure. rb300 minimalistic design demands a maximum precision drilling from armboards and from turntables at the same time which is nearly unrealistic.
sme3009 is s-shaped tonearm with detachable headshell and fully adjustable azimuth, vta, anti-skate but sophisticated and consists of too many joint parts that can invoke unwanted resonance due to its mutual vibrational interactions.
in general still more success can be acheived with rb300 but there could be some problems such as misread or distorted inner grooves, problems setting up the correct anti-skate.