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While I naturally prefer the Mach Bike because of its speed, if I have to switch to the Acro Bike to access otherwise inaccessible areas, I will (I'll just switch back straight after!)
This was actually pretty hard for me. I liked them both. Mach Bike is nice and fast, but the Acro Bike let you do cool tricks here and there. In the end I chose the Acro Bike because sometimes the Mach Bike is a little too fast and I liked the concept of the Acro Bike more. The tricks were fun to do! ^^
I could never control the Mach Bike worth a damn when I was a kid, so I always went with Acro, and it ended up being really cool to reach all the secret places you could hop to.
Mach Bike. At first, I couldn't get the hang of it, but once I learned to control it, the rest was history. :] The Acro Bike couldn't keep up with how fast I was, so naturally I didn't settle for something inferior.
When I first played Ruby and Sapphire, I loved the Mach Bike simply because it was faster and I liked challenging myself to see if I wouldn't bump into anything on Cycling Road and places like Slateport. However, a couple years ago I found myself leaning toward the Acro Bike. While it doesn't go as fast as the Mach Bike and is useless in Sky Pillar (except for the first time you go through it in Emerald), I love being able to do tricks and like not bumping into things often. So I'd have to go with the Acro Bike.
Mach bike was my go-to device, should I feel the need to go even faster than normal.
But I think the speed on foot in RSE was actually very significant.
Faster than the other games for sure! So because of that I rarely if ever used my bikes. XD;
I always change my bike multiple times in the game.
Acro bike and Mach bike are helpful to get in different locations, like in Safari or Caves.
Acro bike helps me with encountering wild Pokemons. I just jump on it until Pokemon attacks. It's not that one bike is obviously better. They both have advantages and disadvantages.