I did my secondish indoor grow in soil. I don't like it indoors personally I prefer hydro for indoor. I use growpito Sim mix but I've used coco as well. If I didn't have the money I would choose coco but if I did I would choose this current media every time lol.
I like coco and grow my vegetables in it because I can't afford more sim mix right now. Coco needs a pH between 5.8-6.2 and needs to be rinsed thoroughly then pre soaked in a 1/4 strength solution of your preferred nutrients. Canna makes a specific line for coco but I prefer Mega Crop and something like Real Growers Recharge. I reuse my coco, I reuse my sim mix, soil is reusable, I can't really tell you what to choose. When I started in coco I thought coco for life but it uses too much water, soil was pest problems, the sim mix is expensive lol.
It depends on what you're personally after. I'd personally start in coco with some reliable pH and EC meters, a good nutrient line like Mega Crop, beneficials like Real Growers Recharge, extra CalMag and
this website
Message me anytime. I can't grow shit but I know people that can.