If it is, can someone tell me why?
i'm also looking into getting a hardware wallet. i'm wondering if trezor is my only option for dash.
from a n00b perspective it definitely is
i can cold store my wallet.dat / double encrypt that (save in multi drives and locations) and feel double save
Electrum allows you to use a 12 word mnemonic to backup your wallet(s). For cold storage, you don't need an installed electrum anywhere. You just need those 12 words, plus a password for each individual wallet you make. Restoring is very quick, since there is no full blockchain synchronization.
When all you have are words to backup, you can get pretty creative with how you want to hold them for cold storage. You can hide part of the sentence in location A and part of it in location B. You could make a cypher and hide the encoded text somewhere. You could memorize all the words and not use any backups besides your brain. Wallet.dat are susceptible to file corruption, and flash drives degrade. Also, you can take a look at the "Cryptosteel" product for a long term degradation-proof, fire-proof way of backing up your mnemonic.
And last but certainly not least, with Electrum you can use multisig! There's nothing better than multisig for cold storage. You can use 2/2,or better yet 2 of 3 (or more) in which case you store one seed yourself, have a trusted friend store the other for you, and have a backup in a safety deposit box in case one of you kicks the bucket or house burns down, etc. Any two of the three wallets (mnemonic seed+pwd) will be able to authorize a spend. Many more options for cold storage security exist with Electrum.
Well for me Trezor and Electrum DASH have not been a good option. Trezor no longer works with Electrum DASH on OSX and I have not been able to access my DASH for several months now.