Sand is perfectly suited for growing plants. I use Eco Complete in my tanks though. Honestly, any non calcium based sand is great. Get what you like the look of. A few root tabs will be all you need to make rooted plants happy with the substrate. If you want the best substrate then get aqua soil. Nothing beats it but at the price they sell it at it better be the best. lol
Yes they're very similar. In fact the first "root tabs" I ever used were Jobes Plant Sticks (forget which one, maybe the fern type). Many people, myself included, have used Osmocote Plus to make our own DIY root tabs. It releases some ammonia so it's best to only add a little. The safest way and possibly the best choice is Seachem root tabs. They always give good results and have no side effects that I've been aware of in my 10 years of using them. Again, not the cheapest option, but proven to be high quality.