Sure, SPV wallets like Electrum (basically only Electrum, which is the only one I know with solid devs) may be a good entry point for newbies, but I don't like at all the idea of a seed being able to spawn out of nowhere my entire private key history. Don't you see this as a risk?
You realise that since v0.13 Bitcoin Core has, by default, been a seed based HD wallet right?It may not give you a "12 word seed mnemonic" to write down, but nonetheless, all the addresses are generated from a seed.
It's just as likely that someone will randomly spawn your Bitcoin Core wallet as they will an Electrum wallet... Which, in both cases, is so miniscule that the chance of this happening, is for all intents and purposes, ZERO.
There was a thread post somewhere where someone did the math... You're more likely to get hit by lightning while taking a crap, once a year, every year.. For 17 years in a row!
So, how about b2x? Which wallet is the best to claim free b2x? I'm not so sure right now.
That's completely irrelevant... B2x got "cancelled", so there is nothing to claim... 