Used all the above speedos, my review of them all;

Electronise.... relays sticking is a common fault, and control is pretty weak.

Sabertooth.... Everyone I've had seem to forget the centre point during a fight... Don't like any dimension engineering products.

Scorpion XL ... Probably give the best control of all 4, good customer support, very reliable, current handling is a bit low for the price. Nice and small... Would need to make your own surround.

Botbitz tz85a.... Great value for money, reliable, good customer support, good current handling, good all rounder... Would be my choice.