I mostly prefer PvE for big Events, especially for Coalition Events.
A World Reborn is probably my favorite, it has a nice thematic flavor, the objectives tie in directly to the set, and it’s not a huge time hog to complete.
Mostly I enjoy puzzles, and crafting decks to meet specific known or anticipated challenges. For Coalition-level events, this lets me work with the rest of the team to strategize an efficient and effective build.
The other DOM events, A Journey Through History parts 1-4, are also among my favorites as they play to the theme for the set. In my opinion they are among the best PvE non-Coalition events in the game.
I did like the updated objectives for RotGP, but it would have been better had that not happened after part or all of its block had rotate out of Standard. This event could have been better if the new objectives could have been keyed to the unique capabilities of AKH and HOD.
Perhaps if this event were Legacy instead of Standard, this could be done. Or a Restricted format, which allows all Standard cards plus those from the event’s native block (ORI, AKH, HOU, XLN-M19).
The other big issue with RotGP is the node refresh rate. It was good when they lengthened it from 4 hours to 6, but that’s still short of the 8 for everything else. This makes it too hectic for casual play. Plus the unpredictable end time, and short duration of the final refresh, makes it more luck of the draw for highly competitive players to keep up.
Having a standardized 10-12 hours after the final refresh for all events would go a long way to fix this quality of life issue. Making nodes refresh 3 charges every 24 hours (instead of 1 every 8), with the final recharge given 22 hours to play would be even better.
The oversized PvE events, such as Avacyn’s Madness, and Bo4T (especially this one) feel oppressive in their scale. AM is good as an occasional challenge, we’ve only seen it twice in the past year that I can recall.
Bo4T on the other hand, feels like some of the matches were made to be a challenge for the meta of the era when the event was created. But Standard has changed a lot, and this event hasn’t. I almost feel it would be best to break this into two events, nodes 1-3 on part 1, and 4-5 on part 2, just due to the way some of the matches seem to be long slow grinds.
A lot of the old PvE that we rarely (if ever) see anymore would probably be better modified to become part of Story Mode, so players can enjoy them at their leisure.
PvP requires more of a swiss-army-knife deckbuilding approach, and leads to a lot of similar builds as everyone tries to compensate for any eventuality, eventually keying in on the most popular combos instead of rewarding interesting novel build ideas.
This isn’t as bad now that cycling is out of the meta (as far as Standard goes, at least. Still a lot of Deploy the Emrakul Pigs in Legacy).
I prefer smaller events for PvP.
The daily Training Grounds, Across Ixalan, and Trial of the Planes, which I can play as I choose if I feel like it and have the time.
Terror in the Shadows and Emrakul’s Corruption are good Legacy events, with specific objectives keyed to the flavor of the originating block. Short, quick fights (only 3 nodes) makes these good mid-week non-Coalition events.
The KLD/AER PvPs (Emergency Ordinances, Fate is Rarely Fair) feel a bit lazy on the design. 4 nodes, so more engagement than their predecessors, but the same objective for each color? No wonder we’ve almost never seen them in the past year.
HoR and HoD also don’t really tie strongly to their blocks flavor, with the exception of a required PW for one node. But otherwise generic objectives that you may or may not actually have control over whether you can obtain them.
As for the 5-node PvP events, while I like that those from the newer sets (The Dragon War, Race to Orazca) have a strong flavor theme to tie them to their blocks, they can feel over-complicated and tedious at times.