"Eco-friendly tea" is really just green tea sold under a marketing label — it's the same Camellia sinensis leaf as black tea, harvested and then pan-fired or steamed almost immediately instead of being left to oxidise. That one step in processing is the whole difference between a black cup and a green one, and it's why green tea tastes grassy and light while black tea tastes deep and tannic.
Brewing temperature is where most people go wrong with it. Black tea can take boiling water without complaint, but green tea turns bitter and flat if you pour it in at 100°C — 75-80°C is closer to right, which in practice means letting a boiled kettle sit for a minute or two before pouring. Steep it two to three minutes, not five; oversteeping is the other common reason people say they "don't like green tea" when what they actually don't like is a badly brewed cup.
In Persian tea culture, where piarom dates come from, tea is rarely drunk plain and sweetened with sugar the way it often is elsewhere. A piece of date, or a sugar cube held between the teeth, is the traditional way to sweeten a sip without stirring sugar into the cup itself — the tea stays unsweetened and slightly bitter, and the sweetness comes in short bursts from the date instead. It's a genuinely practical pairing: a firm, less sticky date like piarom holds up to being nibbled alongside a hot cup far better than a very soft variety would.
On caffeine, green tea generally runs lower than black tea and considerably lower than coffee per cup, though the exact amount varies by leaf grade and steep time — useful to know if you're drinking it in the evening and trying to avoid the jitters a strong coffee gives you, without cutting out a warm drink altogether.
Loose-leaf keeps its flavour longer than tea bags, mostly because bagged tea is usually cut into smaller fannings that lose aroma faster once the packet is opened. Store either one away from light and moisture, and use it within about six months for the best flavour — tea doesn't spoil the way food does, but it does go flat.
If you're putting together a tea-and-dates pairing at home, https://greendiamond.com.my/kurma/kurma-nabi-online/ is worth a look for the Malaysian side of sourcing, and for piarom specifically the piarom dates exporter page has grade and pricing details. Bulk or recurring orders can go through the contact page directly.