I've been using a few list services at a time. Most of the lists are good as long as your data is good. Tbh it all depends on what you put into your projects, like email, data fields, anchor text ratios, ah proxy ofc. My first place is ser verified lists. Their support and system is slick. If you notice their links uniqueness is more than other sites. Lately, I subscribed with serLinks.com and they offer pretty good majestic trust flow 10+ links.. but it's expensive if you go with a monthly package like me. If you want to build your list for few bucks linksplug.com is the best bang. think about the purpose before make the decision