Well let’s say you install the new mod chip successfully, do you put the switch into rcm mode using a jig or can you solder a trinket m0 to the board and throw it into rcm mode that way?
Let's get this out of the way,
Old hackable switches can be hacked via putting the system in RCM mode. To do that you need a jig, however if you were to install a modchip yourself, there is an option to which you can solder on an RCM strap so that it does the jigging for you (means you no longer need a jig).
New switches are unhackable aside from SX's solution with their own custom modchip. Their custom modchip "behaves" like an m0 trinket for the old switches, with the only difference is that the new modchips dont work on old devices and vice versa. I say "behaves" loosely is because no one knows how SX's modchips work...yet. But from what we can tell from the videos online, it seems to do a combination of exploiting a vulnerability (RCM or smth else) and injecting a code to load their custom bootloader.
So to answer your question, If you have the new modchip on a new device, you don't need to worry about any kind of RCM, no jigs, no modes. The new modchip will automatically do it all for you.
Trinket M0 is only applicable to older devices.
Additionally, since the new chips have not start shipping to the public yet (currently just testers), and Nintendo has placed multiple lawsuits on their resellers, it may be difficult to find a new modchip once it comes out.
TL;DR Assuming your a micro-soldering pro. If you can get your hands on the new modchip, go with the new switch. Otherwise, old switch and install trinket m0.