Can anyone explain the differences between the two file formats? I have a 2600 mile route planned out through https://biketoaster.com and have the option to use either file. Are there pros/cons to using either format? Which format do you use and why? Thanks.

Technical:

GPX and TCX are both XML file formats. Both contain GPS waypoints, tracks, routes, etc.

GPX is an open format, free for development use without licenses.

TCX is a proprietary format developed by Garmin. It allows additional information such as heart beat and cadence.

IOW, unless you plan to use a non-Garmin device, it doesn't matter what format you use going from the website to your Garmin GPS device.

I got this off motionbased, saved it as a text file to remind myself of the differences

There is a limit to how many waypoints can be used to make up the route/course in both TCX and GPX. I do not know the exact numbers but from what I remember TCX can handle longer course.

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Course
- file extension is TCX
- file gets placed in Courses folder on Edge
- Can be created on the Edge or in Training Center based on past ride, many online programs can be used to create them from scratch
- Cannot recalculate on the Edge
- Allows for virtual partner use
- No turn by turn warnings unless you add them in manually using Training Center or online Course creator

Route
- file extension is GPX
- file gets placed in the GPX folder
- Two types of Routes can be created, one that supports autorouting and one that is a track

Autorouting version
- Recalculation can be set to Automatic, Prompted or Off
- No virtual partner
- Turn by turn promps occur automatically
- Can be created using one of many online tools or Mapsource if you own the DVD version of maps
- Can only display one route onthe map at a time

Track version
- No Recalculation
- No virtual partner
- Not sure about turn by turn directions but I am pretty sure it does not support them
- Can be created using Mapsource if you own the DVD version of maps, not sure if the online sites support it or not
- Can display mutiple routes of this type on the map at a time

This is by no means a complete list but will definitly aid in your confusion.

I did some testing the last few days of riding into work. The major difference between the two formats on the Garmin Edge is the ability re-route back onto your course. The Garmin Edge is able to re-route (Automatically or Prompted) back onto your course with a GPX file. With a TCX file, you are informed of being "Off Course" - but it's up to you to find your way back.

The TCX files seem more useful as a training tool during shorter rides you are already familiar with. The GPX files may be more beneficial to someone planning a long distance route on unknown roads.