ORIGINAL: SAVAGEJIM

I am speaking of each as they come right out of the boz (bone stock):

The stock Revo will spank a stock Savage on a track given two identically skilled driver. Though both trucks may have about the same top speed, Revo can get to its top speed much more rapidly than Savage. Revo also has alot of innovations made specifically to improve its handling: ultra light weight, shocks mounted parallel and very close to the centerline, one piece main chassis plate with an engine mount that tilts the engine head torwards the centerline, the list goes on. All these make Revo a great handler with a reduced polar moment of inertia (rotating mass) and the Revo can go into and come out of turns like a nimble rabbit. Maintenace is also a snap on Revo since all the components are right on top of the chassis and very easy to get to for maintenance and repairs.

The stock Savage can take a whole lot of licks and shake them off where the stock Revo will usually break its stock spindly arms. Its TVP design is so durable that other truck makers (CEN, Duratra Warhead, etc.) have addopted this design to toughen up their trucks. The TVPs encage the drivetrain and electronics bo in between them and these componenets are never eposed to damaging forces unless you wreck so badley the TVPs fail catastrophically (I talking about like running into a solid fived object at top speed such the the front assembly totally shears and buckles all the pieces and is compressed into the TVPs such that the TVPs peall back like a bannana). Even the engine in mounted within the TVPs.
The only drawback (for practicallity purpose of design) is that the engine gead is greatly ezposed. Now, the newer Savages have light weight grab bars with engine head protector that do help to protect the engine better. Speaking on the subject of maintenance, HPI redesinged the Savage such the latest Savages to hit the market have easy access housings to make maintenance and repairs as easy as maintaining a Revo. Opening the diff housings to replace the diffs no longer requires taking aprt large components of the truck. The same goes for accessing the tranny.
The electronics boz (I call it the batt boz) has more internal voolume in it to prevent pinched wires (I've ruined an antenna wire and several servo wires in the older batt boz). The batt bo even comes with a port so you can recharge you hump pack without even taking it out! Most of all, the new batt boz totally eliminated cotter pins!!!
Don't get me wrong; the Savage is not invincible. Savages are totalled all the time by people doing stupid stuff (I know, I've done some of those stupid things myself).

Overall, both trucks are great at what they are designed to do. HPI took some great steps forward to improve the Savage and ease in maintaining them was one of their great jumps forward. I should know; as much as I bash and have to replace things, the easy access has made my RC eperience much more pleasant.
Revo is a great racer and most buy it for that. Now, Revo can be made to bash, but you will have to get aftermarket stuff too toughen it up. As far as its stock spindly suspension arms, most, including racers, chunk them and buy tougher aftermarket units. Other parts (particularly the drive train components) are what people upgrade on their Revos to, especially since the TR 3.3 is a much more powerfull engine than the TR 2.5.
Savages can also be made to race and people actualy win with them. Finding the right aftermarket stuff and setting them up is key to making Savage a winning racer. (Of cousre, I am assuming all drives have the same racing skills when I say this.)