I have been using TTY for a very long time (sometimes after I graduated from high school) and I am so use to it. I am now 68 years old instead of 20 years old back then when I first started. I have never tried VP. I guess it is because I don't really like to change when it come to making a call on the new technology like VP or other new devices. I am still glad that the relay services are still using and not closing the relay service. If it did, then I will have to learn how to use the VP (I am ASL user). I am very comfortable typing my messages on the TTY compact device. Both Canada and USA shared the same relay phone number of 711.
I had moved from Canada to USA and the hearing relay phone numbers here are different.
I expressed what I want to say if there were laughter. I just typed "LOL" or you can typed it out like laugh out loud. Just typed you want to say with expression. That is your choice. I hope you have a good journey making conversation on the TTY directly to the Deaf person who have TTY or use relay service to communicate with hearing person who don't have a TTY. 