The correct answer at the moment is Claro.
We have used Claro, and Delancer side-by-side at several locations for personal, business and WiFi applications for hotel and condominuim projects. A few years ago DeLancer's options and service were more reliable. Claro has literally blown them out of the water in the past year for anyone who has bothered to look.
For our property in Los Ceros we recently added their television package as well. Our plan includes a telephone line, 800 minutes of free calls to the USA, Canada, and most other countries around the world, 100+ digital television channls in English and Spanish with DVR, PIP and more bells and whistles than DirecTV and none of the hassles with Sky. And our internet currently tops out at over 7.25mbps. Service has been outstanding from same-day techs on installs to not a single outage of more than five minutes (once when a transformer blew) in 13 months.
The cost for all this and 7.25mbps service? $3,400 pesos/month.
Speedtest:
Ookla Speedtest - My Results
I have a fully authorized Hughes satellite system I have just dismantled for anyone in the boonies without access to Claro, G3/4, or DeLancer that's interested. Thanks to Claro for the first time in 15 years it is not necessary to maintain my US businesses the service is so good. Drawbacks with satellite are cost, (US $150 per month), bandwidth limitations (500mb/day), and latency (200ms+ since the signal has to bounce up to a satellite and back twice each way for every packet) that destroys things like Skype and other VOIP programs.
One big issue not mentioned here with DeLancer, or any cable based internet system, is topology. With ADSL you are you, and no one shares your services. Just like your phone line.
With cable, modems/hubs are placed on every block or neighborhood and everyone in that area shares a connection to that modem/hub. As such everyone's internet speed is limited by the total bandwidth available to that hub. The farther away from the central office, and the more people subscribed to that hub the less available for everyone, and it is to the point now in many locations in Sosua that the total available to the hub is less than the total guaranteed to each customer, and speed suffers. In addition there are severe security issues. During one installation last year in Sosua I was able to see every local WiFi, printer, PC connected to the hub by every users. Hundreds of them. Several WiFi's had default passwords allowing me to snoop inside, change the SSID, etc. if I so chose. Because of the use of the upstream modem your router's NAT settings are useless. No way to access a PC or cameras from outside your LAN using a static IP or dynamic DNS services.
For geographic blocked content Claro's IP's show as DR or Mexico, at the moment DeLancer's show as USA/Miami.
So keep those issues in mind as well if internet is really important to you.