Since all three options exists obviously every option has its benefits. I think most experienced users which are not using suspend to disk (hibernate) would recommend rather systemd-swap or a normal swap file as it’s flexible in size and most of the time a swap partition is just wasted disk space. If you have plenty, then why not having a swap partition which is easy to set-up as well. I still would recommend you to use systemd-swap, it’s the state-of-the-art solution for Arch / Manjaro AFAIK.
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I have different point of view. You see empty wasted space, I see extra Over provisioning for my SSD 
Hehe. I dont care if I have 8 GB more or less. Only what I care is hassle free work, performance, smooth multitasking, playing etc xD
That is not a swap-problem/solution but an ssd-related one.
Ok, so I am good…I have ssd 
Another load info after some uptime (reminder : I use systemd-swap to manage swap & have browser.tabs.unloadOnLowMemory set to true on my Firefox instances) :
[meuh@ordi1 ~]$ uptime
10:15:57 up 1 day, 1:00, 1 user, load average: 2,40, 2,51, 2,54
[meuh@ordi1 ~]$ ps aux | wc -l
277
[meuh@ordi1 ~]$ netstat -an | wc -l
1634
[meuh@ordi1 ~]$ free
total utilisé libre partagé tamp/cache disponible
Mem: 11756 5094 1899 743 4762 5310
Partition d'échange: 511 392 119
[meuh@ordi1 ~]$ swapon -s
Nom de fichier Type Taille Utilisé Priorité
/var/lib/systemd-swap/swapfc/1 file 262140 259748 50
/var/lib/systemd-swap/swapfc/2 file 262140 141896 49
[meuh@ordi1 ~]$ ipcs -mu
------ État de la mémoire partagée --------
segments alloués = 94
pages alloués = 82883
pages résidentes = 29516
pages d'échange = 20
performance de l'espace d'échange = 0 tentatives 0 succès
[meuh@ordi1 ~]$
I know but nothing wrong seeing both pros and cons even though they are distant issues.
It’s just optimism.
There is an entire Wiki article that explains this in excruciating detail:
https://wiki.manjaro.org/index.php?title=Swap
Spoiler alert: Yes, you very probably need swap!
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