Remote for Tesla or the myriad of camera viewing options. I don't think I'll be getting a Teslafi subscription so would discount that.
I have Remote-S, and TeslaFi.
I liked Remote-S because it provided a lot of information in a small space ... but I haven't used it in months, I now just use the Tesla APP (possibly because more than one car, and also PowerWall, so its kinda easier to just use the Tesla APP, and whatever fancy things I thought I was doing before with Remote-S I have grown out of)
But I use TeslaFi all the time. I have dozens of Schedules - making sure that the car is charging at work, and the charger hasn't tripped! as well as pre-conditioning the car before my normal departure. Reducing the charge to 80% at the start of cheap rate overnight, and then putting it back up to 90% an hour before normal departure to get some warmth into the battery in winter so I have less restricted Regen,. Scheduled for a 100% charge before a trip ... and so on.
I quite often look back at where / when I was on/at a particular occasion. When I have some snag with the car the detailed history helps with resolution (including seeing how longer Superchargers actually took to charge, and using that to work out a table of time-per-10%-intervals and so on. I can check the car's status without waking it up (so avoiding some vampire drain), and so on.
If used from new it gives a very useful Battery Degradation graph
TeslaFi offer a 14 day trial (extended to a month if you use a referral code), so you could try it and see for yourself. Some people say the data overload is not their cup-of-tea, and I understand that.