I stuck with insulin syringes for the longest time and truthfully there is nothing wrong with them in the slightest. If your happy with them and don't want to bother like I didn't with pens than I recommend easy touch. More than easy touch what I really recommend is a Sam's Club. They have to let you to the pharmacy without a membership and most of the pharmacist staff will let you slide on buying the needles without a membership, but also a membership is $15 these days so it's whatever. Sam's club member mark brand syringes when you open the bag are easy touch syringes. This isn't a guess or a trust me bro I mean the syringes will say easy touch on them. Anyways this is the cheapest way I know to get easy touch syringes & if they work for you one or two boxes should be more than enough for years less you pin multiples a week and in that case a good and cheap option is all the more important.
I like many made this a hobby and finally decided I want to try a pen. I wanted an auto pen really a gansulin but then I found out about the convipen which is teal instead of green, but 99% the same thing and got those. And I'll admit I am converted. What I like is the needle is clearly going to be sharper because it's not dulled by entering a vial first. A minor difference, likely placebo more than anything, but 🤷. Second and a big one there is mass in the pen and while I could be a little slow and hesitant and really drawing out the process with a syringe the pen is a lot easier to commit and to pierce skin and bottom out. Plus in one press all the medicine is sent automatically. I imagine a non automatic pen with a smooth mechanism would be about as good as well. Third you can purge air out of the vial so it's not sitting there, but counter I assume if you ever hit a blood vessel you could get a reverse flow into the vial that's not a risk with vials and syringes. Anyways pens are fun also there is 3d file for sleeves for gansulin/ convipens so you can change the colors if you want to customize and have different colors for different research options. I like the teal better than the sleeves though. If your on the fence, but have the funds try them out.