Your going to need Roughly a Double Tennis Court Sized Area to Drift a Nitro Properly.. With an Electric, you can Get Good Slides on an Area the Size of a Hand Ball Court.

See Speed is Not Essential for Drift, Torque is, when you say " Slow Drifting" this IS more Technical Drift then High Speed long Super Slideways Action of a High Speed Drift.

Technical Drift is Hard to pull off with a Nitro UNLESS, the engine is Very well Tuned and the Driver has Elite Car Handling Skills.
Nitro Motors Just Dont seeem to be happy doing Technical Drift, they either Over rev and Chew Tyres, Or Bordering on Stalling.

Electric Has the Advantage of the Motor Being able to control the Revs Via the Throttle Commands of the Trigger and most have a Nice Torque range through out their RPM band Torque comes on nice and Low where as With the Nitro, it tends to Occur in the Upper Scale of the RPM Band..

In Short, Electric requires Less room, has a Smoother Throttle Response and Throttle control, No Mess and No Fuss, No need to re-tune the Engine for a Cold moring,only to re-tuune it again for an Middle of the Day Run.
Tempreture differences dont affect the Electric Motor..