Uranium and the watch, for time travel reasons. Gotta refuell the DeLorean and keep track of relative timelines.

The synth and the LSD. I'll dilute the LSD in water, give it to a while crowd and jam on the synth, becoming the either a music legend, a messiah, or both

Spices - You can become wealthy as HELL, and your modern day clothes can easily make you seem like some foreign merchant, so can get you people interested. You DO need to sell those spices fast, however, else you WILL get robbed

Motorcycle - As others have said, you can get it to run on grain alcohol once out of gas, but that's not the real prize with it. The real prize is using your new found wealth to get smiths to make more engines, using that as a blueprint, and essentially kick starting the industrial revolution. Mind, this IS going to be used for war, so prepare to become a war mongul

For a couple of the electric options, and instead of saying "the Moog is magical", I want to believe they come with a portable solar charging panel or mat on the side, with compatible charging plug, of course.

A TW200. 🤩
Solid choice to take with. I want one but they're simply not practical for me. :/

Can I just do the spices 2x? They seem the most useful without getting myself killed for magic or just stabbed in a mugging for having something too advanced.

I just want some spices to make my food not bland, and maybe making some dollars in the process. Not trying to get killed over my possessions. Spices, I'm sure, went for a good price but less likely to get murdered for selling some as opposed to using a motorbike, or laser pointer.

The dab pen is tempting, but with my layman's current knowledge, I should be able to work growing out. More concerned about all the infections and what not my body has no defense for. I'll take 2 vials of antibiotics over any of the other options. Or do a spice rack and a medicinal herb book.

They Synth and the Warheads. I'm sure the Warheads alone are flavorful enough to convince any Medieval person that I am a God (or or the Devil, lmao), but the sick beats from the synth would seal the deal. (Once I learn how to play)

Gun with bullets, then set out to change history by shooting 4 kings or something with a bullet. Then I’ll save the last bullet as a very last resort for anything.

the uranium even if you can't make a reactor

you can use it in sieges, in assassinations, you can have it sterilize your lord's rivals so they can't have kids without anyone knowing

you can make safeish samples using shielding, lead is readily available

you can expose fruit/vegetables so they keep better over the winter, killing bacteria

you can sterilize food and water, make it safer for consumption