It's defiantly cheaper going foundationless.
Penny wise, pound foolish is what I would call that. It may seem slightly less expensive up front to go foundationless, but, it ends there. Particularly for a new beekeeper, first time a comb falls out of a frame because it's not attached yet when they inspect the hive, it's just not worth the few pennies saved. The other thing, OP mentions starting with a nuc, so it's likely on deep frames. What many of the strong proponents of foundationless forget to mention, most of them use medium frames. Foundationless in a medium can be relatively sturdy, but it's a different story in a deep frame, especially fresh new comb that hasn't been fully drawn and attached both sides and bottom of the frame.
I've never had problems getting new comb drawn, be it on plastic, or on foundationless frames, as long as there is a flow on. With no flow running, I've never got frames drawn of any variant without substantial feeding to push them.
All of our standard size boxes are populated with plastic frames. I have a dozen boxes of mediums that we use foundationless, but they aren't intended to see the extractor, we use them for cutting comb honey. My mating nucs are filled with half size deep frames, and I didn't bother with foundation in those either. they are small enough the bees drew them right out and attached the comb well on all 4 sides.
Yes, I have all the variants in various boxes here, and no, I would NOT recommend somebody starting out new to go with foundationless frames, not of any size. Start with foundation, and if it's going to be wood + wax, wire it properly. If it's plastic, you dont have to worry about wiring. Only after you are comfortable handling a frame of bees, consider foundationless. If you start out learning with it, particularily if its deep frames, it's going to turn into a disaster of broken combs that fall out of the frames when you lift them out of the hive.