Brushless or brushed
As per previous post - Brushless for all the same reasons just make sure whatever brushless system you go for you can 'update' it or change the settings really easily. Bear in mind that a good brushless speedo will be able to run almost any motor 21.5 (Slow and smooth ) right down to an insane 3.5 (Fast and huge torque ) and be tuneable to your requirements and be able to handle 1 or 2 cell Li-Po ( 3.7volts or 7.4volts ).
Also another factor is what you want to go play with, 12th scale / 10th touring car / 4wd buggy. Some speedo's are better at certain things and this can be reflected in price and also their footprint ( how big or small they are ).
Best thing to do is exactly what you have done which is ask a question on one of the helpful RC Forums available.
I am not affiliated with any particular brand or race for any team but I would put my money in to a Tekin RS Pro or XERUN 120 amp version.
By brushed speedo standards both these speedos are at the top of their game and relatively cheap considering how expensive some brushed speedo's were before we changed to brushless !
These 2 will run 'almost' any motor and will possibly suit most budgets and both are upgradeable through software updates from the manufacturer.
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