Rackspace Cloud Load Balancers vs. Amazon Elastic Load Balancing

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Rackspace Cloud Load Balancers Amazon Elastic Load Balancing
Support Chat/phone/ticket support available 24x7x365 To receive 24x7x365 support for Amazon EC2, you pay the greater of $400 per month.
Dedicated Public IP Address A dedicated IP address allows for use as a root record for a zone. When you create an ELB instance, you get a public DNS name; however, it’s not very user friendly and you will want to create a CNAME record in DNS to redirect to your URL.
Access Control List (ACL) Rackspace cloud load balancer has an ACL-based security model. Access control list feature is not available.
Connection Logging Logs are sorted, aggregated, and delivered hourly to Cloud Files™, which is perfect for users who need to perform tuning, inspection, or analysis. Connection logging feature is not available.
Connection Throttling Rackspace cloud load balancers have a connection throttling feature which imposes limits on the number of connections per IP address. Connection throttling feature is not available.
Selectable Algorithms Customize the behavior of your cloud load balancer with selectable algorithms, including: random, round robin, weighted round robin, least connections, and weighted least connections. ELB utilizes only a non-configurable round robin load balancing algorithm.
Advanced HTTP Health Monitoring Rackspace Cloud Load Balancers can use synthetic transaction monitoring to inspect an HTTP response code and body content to ensure the application or site is healthy. While HTTP and TCP-based health monitors are available, ELB does not permit users to define an acceptable status code or body regular expression to match against.
Shared IPs Shared IPs facilitates easier management and better IP utilization of load balancer configuration. ELB does not permit users to share a single IP address across multiple load balancers, but does allow for a single load balancer to support multiple port configurations.
Internal Virtual IPs Internal virtual IPs feature allows you to load balance internal services, without being penalized with external bandwidth charges. All ELBs are configured as public virtual IPs. An internal virtual IP option is not available.
SSL Termination Does not support SSL termination at the load balancer. Supports SSL termination at the load balancer.


Source: http://www.rackspace.com/cloud/cloud_hosting_products/loadbalancers/compare/