A while back I attended a race clinic hosted by Ryan Lutz and Joe Bornhorst... one of the topics of discussion was selecting a proper servo.
For starters they recommend selecting a brand that offers replacement gear sets as a bare minimum, and if budget allows, consider aluminum case servos or at least a brand that sells replacement cases should you tear a mounting tab in a nasty crash. Metal gears are a must, with titanium being a pinch more durable than steel in general. They also said everyone's reaction time is different and most folks should select a speed somewhere between 0.08 - 0.12 sec/60° and then use the "steering speed" feature on the radio to dial back the servo speed for your desired reaction time.
It's a good idea to first look at setup sheets to see what size servos folks are using for the class you plan to race... i.e. get a lighter low profile servo is less weight up front is desired (typically used in 1/10 stock classes) or select a heavier standard servo with full aluminum case to add more weight up front to get more steering response. There is no single right/wrong answer, just a bunch of variables to consider when making your selection.
For a budget minded driver, I'd consider the EcoPower WP120T just to start out with, replacement gear sets and servo cases are very reasonably priced for those who require buying from a US retailer with a reputable 1 year warranty.
If you are willing to restrict yourself to a 30 day warranty, then consider the OEM for the EcoPower 120T which are JX branded servos. The replacement gear sets are 100% compatible between both servos.
If you want the same servo enclosed in a solid aluminum case then consider the JX HV7232MG servo
If you want peace of mind then I highly recommend the ECO Power WP250T which is the most recent release having some upgraded internals with a different gear set.
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