The reason no one talks about the antpool one is because it doesn't work any more... and it hasn't for quite some time. 
While it says "transaction accelerated" (or "acceleration successful" or whatever), when you submit a transaction, it does not actually do anything. I've tried it previously, got the "accelerated" message and then watched Antpool mine around 10+ blocks while the transaction sat unconfirmed for a week.
While it says "transaction accelerated" (or "acceleration successful" or whatever), when you submit a transaction, it does not actually do anything. I've tried it previously, got the "accelerated" message and then watched Antpool mine around 10+ blocks while the transaction sat unconfirmed for a week.
Well, based on my experience last 2019-2020 that this tool seems not working unlike before around 2017. I always use them and other PushTX tools they are almost not working except for ViaBTC.
I heard many users here on the forum use that tool but most of the responses are "tools is do not work" and I heard before that only users who mine on their pool can only use their free service just like on F2pool the only difference is you don't need referral code to use that tool.
Anyway, the transaction is confirmed under block 680078 mined by ViaBTC. So for now ViaBTC is the only working free tool for accelerating transactions.
