blocking link crawlers

Hi folks,

How do you block link crawlers like ahref, moz, semrush etc from crawling your websites?

I want to block them from htacess, but I found many different codes and I am not sure which one is the best, in example:

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{HTTP_USER_AGENT} (ahrefsbot|mj12bot|rogerbot|exabot|dotbot|gigabot|semrush) [NC]
RewriteRule .* - [F,L]
</IfModule>

or

SetEnvIfNoCase User-Agent .*rogerbot.* bad_bot
SetEnvIfNoCase User-Agent .*exabot.* bad_bot
SetEnvIfNoCase User-Agent .*mj12bot.* bad_bot
SetEnvIfNoCase User-Agent .*dotbot.* bad_bot
SetEnvIfNoCase User-Agent .*gigabot.* bad_bot
SetEnvIfNoCase User-Agent .*ahrefsbot.* bad_bot
SetEnvIfNoCase User-Agent .*sitebot.* bad_bot
<Limit GET POST HEAD>
Order Allow,Deny
Allow from all
Deny from env=bad_bot
</Limit>

which one would you recommend?

Thanks