My top 5:
CTF - everybody knows I love CTF. I think it has the best practical use case of objective and fast-paced combat of all other servers. Also works well for competitive clan wars, however, cheap tactics is all you need.
EAD - being a cannon fodder, one life thing ain't really my style, but its a really a nice competitive gamemode nonetheless. Because of its nature, its a more slower paced competitive gamemode than CTF is, but it brings out the tactician in you far better than CTF ever could. Works well for clan wars just as well as CTF does.
EC - the XE replacement as Charley said, I'm sorry, lol but doesn't mean its bad, it's quite the necessary server to have just non-competitive craziness.
Miami-Dade - racing. If I could script I'd make a lot of these types of servers to be honest. I appreciate the long-term effort to promote racing from a very simplistic script.
VKs - credit where credit is due, I spawned a Hunter in this server one day fighting a Sea Sparrow around VCPD at Washington Beach. That experience is where Vice War 8's push for aerial warfare came from. That shit was too fun to give up on, I had to change the dynamic this year
Some mentions:
VCCNR - a lil confusing for my taste but I deeply appreciate the effort put there
LW - whether 2009 or 2019, I still don't like this server. XE any day. I appreciate the push for stability though. Back in the day I think you had 100 kills the server would crash or some shit? And was the only server that really made sniper popular to me (though it had VIP access back then).
Argonath - not much of a role play fan but its a solid enough RPG experience for VC:MP. Heists were fun but hard to setup. Taxes too fucking high and they robbed all my cash in the bank account.
Liberty City Unleashed - for how many years now have I seen this server empty for? It's like Miami-Dade unfortunately, but it is refreshing map wise. In my opinion they should combine cuz Vice City is no map to race on, and Libery City Unleashed is just...there.
PTP/KTB/RTV - I wished they weren't EAD/CTF style. They could've been handled differently in my opinion, especially PTP since I was making one myself but got beat to it
SvM - I'm not a VU if you ask me my activity for this server lol