1. Is not available on a lot of exchanges, only a few
2. The technology is new and relatively untested
3. No other utility other than being a currency, which puts it in competition with a lot of other similar projects
from https://www.tokens24.com/cryptopedia/basics/nano-previously-known-railblocks

Nano security in my view is quite secure and easily trump. I can body say that malicious can hardly take control of 51% of voting. Attack would also have to buy up to 51% of Nano which would cost billions that can destroy the network if attacked. V19 gave Nano network transactions immutability.

Spam attack vectors are the other security concern. But since Nano make use of dynamic PoW this give it same principle as XRP.

But i will advice to talk on Nano security more online in order to get expertise opinion.

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Nano is the currency of the people. Not the institutions. Bitcoin fees often exceed $10 per transaction. Nano has no fees, and never will.
* Bitcoin transactions take an average of 10-60 minutes. Nano transactions take 0.2 seconds.

* Bitcoin transactions use ~741 kWh of electricity each. Nano transactions use 0.000112 kWh.

* Bitcoin can't scale past 7 tps. Nano's tps is uncapped and limited only by hardware.

* Bitcoin miners will inflate its supply until the year 2140. Nano is fully distributed.

Bitcoin is not the inevitable long-term "winner" of cryptocurrencies. Its technological limitations and disastrous environmental impact would create an incredibly bleak future for the everyday person. There is a clear alternative to Bitcoin, and they don't know it exists: Nano.

The rumor that Nano is being suppressed by crypto miners and Bitcoin maximalists has been around for a very long time, and it makes sense. Nano works ridiculously well, and is there to eat the cake of all the miners who are raking in millions a day. BTC maxis and miners hate the word Nano, and have a strong incentive to literally pay to have it disappear from the face of the earth. Bitcoin influences on Twitter have muted the word Nano because they know their thesis is ruined when it gets mentioned.

Nano security in my view is quite secure and easily trump. I can body say that malicious can hardly take control of 51% of voting. Attack would also have to buy up to 51% of Nano which would cost billions that can destroy the network if attacked. V19 gave Nano network transactions immutability.

Spam attack vectors are the other security concern. But since Nano make use of dynamic PoW this give it same principle as XRP.

No transaction fee. Uses MUCH less electricity. Transfers in seconds.

All the nano has been distributed already.
The transfer speeds are not as fast as they were promised.
Faucets generally do not work well and only pay miniscule ammounts.
There are less than ten drop spots active in my country currently.

1 nano is not private it is pseudonymous . If you buy anything using nano they can see all your nano .
2 no smart contacts it makes nano very hard to integrate into decentralized exchanges.
3 price fluctuates up and down

I think the security for Nano is better, certainly the people will use more and investments will be better

the main disadvantage is the lack of other purpose than being used as a currency, as Bitcoin is the dominant cryptocurrency and is solving its fee and receipt time issues with Lightning Network, the Nano will not be as useful and will be a used currency only by enthusiasts. The fact that transfers are made without fees increases the risk of spam on the network, this has already happened and it is a problem that Nano unfortunately has.

It's just because it is free

Nano is the currency of the people. Not the institutions. Bitcoin fees often exceed $10 per transaction. Nano has no fees, and never will.
* Bitcoin transactions take an average of 10-60 minutes. Nano transactions take 0.2 seconds.

Good