I think I would just like a handheld, I've never been great with windows outside of the basics so perhaps the SD is the more accessible option for me.
I have a cheap laptop that does well for work based stuff, but not gaming.
Also when I travel it would be nice to just throw it in my bag and take it out easily and be done with it. I'm looking for something specifically portable.
buying a handheld PC is a secondary device. shouldn't be your main. I am not sure why you think buying a handheld device is any easier than a normal desktop. outside of the SDD / NVME size, you are not going to be able to upgrade anything. and soon it will be weak compared to any other platform. mobile CPUs / GPUs are not really that amazing.
I would argue for the same price you get yourself a much better PC in terms of performance. and even if it has a similar performance, it will have a much better upgradeability in the future.
You mentioned traveling. how much are you traveling? only you can answer that. if you are always traveling then year a portable PC is probably the better option.
Steam deck is not powerful, the other devices you will have to do lots of optimization per game as Windows OS in general doesn't translate very well into portable devices ( serviceable, but prepare to spend lots of time in the settings menu to get the performance you want)
unless you playing old games, many of the new games will be in low and very low to and if you are lucky "mid" settings if you want usable frames. again, these desktop APUs from AMD are not that really powerful.