NXT and BTC.
I have to concur, especially if cryptos are destined to enter a bubble that will climax by the end of this decade. [Cryptos now -> Internet 1994; cryptos 2019 -> Internet 1999: that kind of thing.]
One of the paradoxes of bubbles is that the punter who gets in early, before the real bubble takes off, and then does nothing else but HODL all the way through, ends up with a solid gain even at the worst of the post-bubble carnage. Cases in point: gold in early '77, YHOO in the summer of '97.
In fact, the best time to buy and HODL in this way is the quiet time after a false bubble: a slam-down that looked an awful lot like a bursting bubble at the time, but in retrospect proved to be just another bear market. Example: real estate in 1991-2.
Example 2...But this strategy only works if you buy and HODL quality. Right now, I have to say that the quality bill of HODL is pretty much confined to Bitcoin and Nxt.
I'd like to say that
NFD fits the bill, but right now it's too young and too bare-bones a Nxt clone to belong in the bill of top-level quality. As a friend correctly informed me in a PM, NFD at the moment is a pure speculation. It's incredibly cheap
at BTER right now, but a professional economist would say that its low price is a reasonably accurate handicapping of its present value. Such an economist does have a point. So I do have to admit that, if you want to play an upcoming bubble by HODLing all the way through and you want to diversify by adding a crypto-2.0 coin, you should diversify by HODLing Nxt and only Nxt.
NFD is only for long-term speculators at present.
I don't mind catering to pure speculators at the moment: I've been a veteran speculator myself in the penny stock market until recently.
Right now, my immediate agenda for NFD is to grow it slowly and keep NFD a "sleeper" crypto - like Reddcoin was until recently. My way may seem flaccid, but I'd rather not have a swath of ticked-off bagholders like the Qora dev has to contend with. And this way jibes with my penny-stock speculations that banked real profits for me. Leaving aside the (much bigger) profits I threw away because I was too impatient and undisciplined to stick to my strategy...
But I am writing this post for people who don't have the time or taste for pure speculation. If you're one of those, then the best coin to HODL in my opinion is Nxt. As well as Bitcoin, of course. The one-year chart of the latter clearly shows a false bubble, like a chart of real estate in '91 or so. The
all-time chart of the latter shows a formerly smokin' hot altcoin, which - uniquely in altcoin land! - has more-or-less gone sideways when the early frenzy faded away. For that long-term sideways churn, the Nxt 'bagholder' really has the Nxt dev team to thank.
So there you go. Name recognition, as confirmed by a lookie at the long-term charts, show that "Quality" means Bitcoin and/or Nxt. So, if you plan to play a future bubble - a real bubble - in advance by buying, HODLing and forgetting, your choice is limited to the big "B", Nxt, or both.
One warning. If you do play a future bubble this way, you will be enormously tempted to monkey around with your HODL when cryptos become smokin' hot. The temptation is so enormous, you might even have to cold-wallet your HODLings and take a nice, long vacation from cryptos entirely. There's just too much temptation to get full of yourself and assume that you can bank even more $$$ by plying those overly clever traders' tricks that are proven to drag the whole lot of 'trading geniuses' right into the abyss when the carnage starts.
Case in point: Internet-stock day-trading, 1999-2002...
1000's of coins to date, altcoins are coming out of the woodwork & not in a good way either!