Hello Vemss!
Thanks for your comment! I've recently played 2 games on comet Ashe, and it feels fine to, but not in every matchup. The main reason to pick this up is for poke with your Volley, and with the Manaflow band in the second rune (first minor), this could work out. But when you'll have big fighting lanes, very agressive enemy laners such as Lucian and Thresh, I wouldn't really take it because then you'll miss out on a lot of trades. The main reason I play Ashe is for counterpicking. She's very strong against champions such as Vayne and Kalista, and in these matchups I feel like the comet pick up is really handy, because they have no chance to trade back and they just slowly lose their entire hp bar. Yet for starting Ashe players I would recommend Lethal Tempo, because it's a bit safer and it's better for your learning progress!
I'm always open for further questions and discussion! Once again thank you for your comment buddy!

DSM Aubery

While I am not a big fan of Ashe due to her immobility, I would say that the IE rusrh is probably my preferred build. Considering that she is immobile, she needs to win fights as quickly as possible. IE gives her +25% damage on every auto after her first and a ton of base AD. She can esaily kill if someone is caught out. The BORK rush I usually prefer on champs that either make extra autos, Lucian, to get more out of it or need to stack stuff, Vayne/ Tristana. Ashe gets a lot more out of crit-chance throughout the game compared to other champs since it directly buffs her DPS rather than give her the chance to double her damage on some shots. However, both builds are valid. They both look great and you should definitely keep both in your guide, just change which one is displayed as primary based on which one you think performs better.