faster does not mean better
Keep in mind a lot of the TiCR reviews you read on this board are from saltwater anglers looking to handle heavy grain lines or overline and fight the wind with tight loops.
For trout fishing your primary interests should be roll casting, line mending and tippet protection which are the strong points of moderate/slow action rods. If you plan on doing a lot of nymph fishing you will be roll casting the majority of the time so it's important.
In most situations you will be casting to fish within 30 feet. Delicacy and line control are what you want - not distance casting.
Don't get sucked into the idea that if you can cast it farther at the fly shop it must be the better tool for the job.