on the iOS side, they fixed the url scheme to send plain text to Airmail from Drafts.
on the Mac side the one tap on the spacebar to create a pdf in the DT inbox is gold. I was not a DT user the last time I used Airmail so that feature alone, makes it worth it now. Also I like just hitting return to auto forward to a specific address. As you pointed out the Omnifocus integration is more robust than spark, and it has fantastical integration that spark is missing. so final verdict, spark loses.
I have a feeling the word “second” in the thread title is… not telling the full story. 
Thanks for elaborating, and now… you make me want to try it again
Well, last time it was me who brought you back to it so I guess what comes around goes around 
Dealbreaker. After a year and a half of reporting the bug, the devs still haven’t fixed send later with aliases and as always with Airmail, it fails silently.
Do I tell you how angry I am at the devs for leaving such a lack of polish? No, of course not. You felt like this yourself.
did you email the report or chat with them?
Several times throughout the last 18 months, via chat, on their Slack, checking in, again and again. I got conflicting answers from support « we don’t support that » « actually we do » « do we? » and the devs themselves basically said « ah ». 
I thought this was a one person operation… there are actually multiple people contributing to this disaster? 
I saw three different names on Slack, two of which are moderately active. (Because they manage their Slack as the rest of the operation: it’s a vast silent chamber where you’re never really sure if there’s still anybody there - true story, at some point people where truly wondering if the company had not gone bankrupt since the silence was deafening) plus one person for tech support that I know of.
This company really gives a masterclass in how not to manage a community (if you think Smile is tone deaf, then Bloop beats them by so, so far). Did I mention they also used to buy 5-star reviews on the App Store?
If that is accurate, I will never use Airmail. I will not knowingly do business with a dishonest company. Why would I trust my email with them?
And please don’t lecture me [I’m NOT referring to @anon85228692 per se but to anyone reading this] 
about Google, et al. I have taken every possible step to avoid Google (and other companies with known and suspect practices) as much as feasible given that my organization uses Google Suite (or whatever they call it today) and one’s limited options short of becoming a tech hermit.
I have been looking just now about the reviews I saw a few months back: they’re gone now, but they were on the French App Store, written in very clunky English, sometimes entirely off the mark (something like, I quote from memory “I like it when it does that and it is what is the best ”), and they were the only reviews that got answers. There were about 8 of them, all very similar, all equally barely understandable, all 5-star. I reported them regularly for weeks.
Now, to be entirely fair, this does not prove they bought reviews. But honestly, this is suspicious as hell.